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The National Football League preseason is the period each year during which NFL teams play several not-for-the-record exhibition games before the actual "regular" season starts. Beginning with the featured Pro Football Hall of Fame game in early August, four weekends of exhibition games are played in the NFL to date. The start of the preseason is intrinsically tied to the last week of training camp.
Exhibition games have been played in professional football since the beginning of the sport. In fact, until league play was formalized in 1920, one could consider virtually all of an independent professional football team's schedule to be exhibitions (as in test matches). In the early years of the sport, teams often "barnstormed", and played squads from leagues outside their own, or against local college teams or other amateur groups, charging fans whatever the traffic would bear.
When the NFL was founded in 1920, all games counted in the standings and would be used to determine the league champion. In 1921, this was revised to only count games involving two league members, thus allowing non-league exhibitions, but effectively banning exhibitions between two league teams. This rule had a direct impact on deciding the 1921 championship, in which the losing team insisted that the deciding game only be considered an exhibition.
In 1924, the league again changed the rule to declare any games held in December or later to be exhibitions. By the mid-1930s, teams prepared for a standard 12-game regular season schedule, although even as late as 1939 teams would schedule non-league exhibition games both before and during the season (during bye weeks). The Pittsburgh Steelers (then known as the Pirates) were well known for playing both in the NFL and on a limited schedule in the decades-old Western Pennsylvania circuit in the 1930s.
In the 1960s, teams began playing 14 regular season games, with a corresponding decrease in the length of the preseason. Teams played four or five preseason games each year; for example, in 1966 each of the nine American Football League teams each played four preseason games. By the end of the decade, however, there would be a rapid increase in the number of preseason games.
With the AFL-NFL merger of 1970, the newly merged NFL was granted a Sherman Anti-Trust Act exemption, which emboldened some team owners to expand the exhibition schedule and to require season-ticket holders to pay for one, then two, then three home exhibition games if they wanted to keep their season tickets.
From 1970 through 1977, the NFL season consisted of 14 regular season games and six exhibition games, sometimes but not always three at home and three away (the 1973 Washington Redskins, for instance, played all but one of six preseason games at home), with some played at neutral sites. In 1978, the regular season was lengthened 16 games, and the exhibition season was cut from six to four games.
From 1999 to 2001, when the league consisted of an uneven 31 teams, some additional exhibition games (usually two or three) were played over Hall of Fame weekend. In order to account for the uneven number of teams, each team was required to have a bye week during the exhibition season. Most teams held their bye week in Hall of Fame weekend, while the others utilized them somewhere else during the exhibition season. This practice was abandoned after the Houston Texans were added to the league in 2002, giving it an even 32 teams.
The COVID-19 pandemic wiped out the whole 2020 preseason.
Unlike the regular season, the exhibition matchups are not based on any rotating or set formula.
The NFL schedules the matchups for all of the exhibition games; from 2002 to 2019 & resuming in 2021, individual teams have been allowed to negotiate their own deals to play each other during the preseason: the league allows individual teams to provide input into desired matchups and determines the matchups for any games that were not individually negotiated, while the league sets all game dates and times.
The exhibition season schedule is released in the spring, shortly before the regular season schedule is announced. The NFL has set a loose precedent of determining exhibition matchups:
The teams that play in the Pro Football Hall of Fame Game are determined solely by the league (and the Hall of Fame committee), featuring one AFC team and one NFC team. Its matchup is announced well in advance, around the time of the Super Bowl, when the Hall of Fame inductees are announced. Under some circumstances, the matchup is planned well into the future. For example, the Buccaneers played the Steelers in the 1998 Hall of Fame Game, a matchup that had been announced in 1983. In recent times, if there has been an expansion team added to the league, that team will be invited to play in the Hall of Fame game (Carolina, Jacksonville, the new Cleveland Browns, and Houston all played in their expansion seasons in 1995, 1999, and 2002 respectively). The 2009 game, however, was between two original American Football League teams: the Buffalo Bills and the Tennessee Titans (formerly the Houston Oilers). This matchup was announced after Ralph C. Wilson, Jr. an AFL founder and the only owner ever of the Bills, was inducted to the Pro Football Hall of Fame on February 1, 2009. The Titans' owner, Bud Adams, was also the only owner his team has ever had. Wilson and Adams were the two last surviving members of the original AFL ownership cabal and are two of the only three men who have majority-owned a Professional Football franchise continuously for fifty years (the late George Halas, who owned the Chicago Bears from 1920 to 1983, is the third). The Hall of Fame game served as a kickoff to the 2009 season, which would have been the 50th season of play for the AFL had it survived as an independent entity. The 2011 (canceled), 2012, and 2016 (canceled) games were between two NFC teams. Normally, the Pro Football Hall of Fame Game has an AFC and NFC matchup, but that is not always the case.
Prior to the 1970 AFL-NFL merger, it was common for teams to play each other twice in the same pre-season. Among the most recent occurrences were in 1992 when the Dallas Cowboys and Houston Oilers played on August 1 in Tokyo, then again on August 15, in Dallas, and in a more recent season, the Buccaneers and the Dolphins played each other twice in one preseason. To this day, although multiple preseason games against the same two teams are no longer common, two teams may hold a joint practice and scrimmage in addition to a preseason contest (see, for example, the Buffalo Bills and Pittsburgh Steelers in 2014). It is still somewhat common to see teams that play each other during the regular season once play a preseason game (either the two teams split in playing at the other's home stadium, or the two teams play at one of the other's home both times); the majority of preseason contests each year are between teams that do not play each other in the regular season that year.
It was also commonplace for division opponents to play each other in the preseason, due to the larger size of pre-merger divisions, but has not happened since 2000, when the Seattle Seahawks played the Oakland Raiders. 
As recently as 1984, the Cleveland Browns and Pittsburgh Steelers played a preseason game despite the two being bitter rivals. In 1999 the San Diego Chargers played their division rivals the Denver Broncos and Kansas City Chiefs in the preseason.
Since the league realignment in 2002, when the NFL began to have 32 teams, teams more than two time zones apart normally do not play each other, to save teams from long travelling times. However, there have been some exceptions. In 2009, the San Diego Chargers played the Atlanta Falcons in Atlanta. The San Francisco 49ers played the Baltimore Ravens in 2014, and the Los Angeles Rams played the Baltimore Ravens in 2018, both in Baltimore. The Arizona Cardinals, who are on the Pacific time zone during August, have played the New England Patriots in 2006, the Pittsburgh Steelers in 2006 and 2009, the Washington Redskins in 2010, and Atlanta Falcons in 2017.
The College All-Star Game, usually the first game of the preseason, was played annually in Chicago from 1934 to 1976 (except 1974), and featured the NFL (from 1966 World) champion against an all-rookie team of college all-stars.
Between 1950 and 1961, the NFL also attempted exhibition matches against the Canadian Football League (mixing NFL and CFL rules), but these, too, were abandoned after the 1961 preseason, as the NFL won all six matchups. The CFL finally won a game against American opposition in August 1961, but this was against an American Football League team; as a result of the embarrassment, the AFL opted not to play the CFL again beyond that one game.
From 1967 to 1969, during the transition period leading up to the formal AFL-NFL merger, the NFL and American Football League played each other in a series of exhibition matches; notably, the 1969 match between the Buffalo Bills and Washington Redskins was the only time Vince Lombardi ever lost to an AFL team. The 1968 games were played under an experimental rule that eliminated extra point kicks and required a play from scrimmage to score one point (a rule later implemented by the World Football League in 1974 and the XFL in 2001).
Games against non-league opponents were occasionally played after that time, usually with the NFL teams sending a rookie "split squad" to the game. In 1969, the Atlanta Falcons rookies defeated the Alabama Hawks of the Continental Football League 55-0,  and in 1972, the New York Jets rookies defeated the Long Island Chiefs of the Seaboard Football League 29-3.
The 1976 All-Star Classic was the last game between an NFL team and a non-NFL team. This is in contrast to current practice in MLS, NBA, NHL and recent practice in baseball, in which teams play exhibition games against non-league teams.
The exhibition season typically begins the first weekend of August with the Hall of Fame Game; though in some years it can be on the second weekend. Previous seasons have seen the American Bowl game held the last weekend of July. The first full schedule of exhibition games is held the following weekend. Most games are held on Thursday, Friday, or Saturday nights, with one nationally televised game each night of the week: NFL Network airs a Thursday game, CBS and Fox a Friday and Saturday night game each, NBC with Sunday night games, and ESPN a Monday night game. Unlike the regular season, CBS's and Fox's national exhibition game opponents are selected regardless of conference. Four full weekends of games are held. The fourth and final full week of exhibition games (fifth weekend overall) usually has teams playing exclusively on Thursday night (plus Friday, if any), with no national games. This allows teams a few extra days to prepare for the first week of the regular season. It also prevents conflict with the start of the regular seasons for high school and college football, allowing those venues to expand their first weekends' games from Thursday through Monday (Labor Day).
There is usually a conflict with the Major League Baseball season, a situation seen in the 2015 preseason when the Pittsburgh Steelers moved a Sunday evening game against the Green Bay Packers at Heinz Field to a traditional 1 p.m. kickoff to avoid parking conflicts with the Pittsburgh Pirates across their shared lot at PNC Park, when the Pirates had a game moved to Sunday evening as part of ESPN's Sunday Night Baseball.
On various occasions, severe weather or other factors, have postponed or outright canceled some preseason games. Due to their exhibition nature, suspended or canceled preseason games are normally not made up. In 2004, Hurricane Charley postponed a Tampa Bay game against Cincinnati from Saturday until Monday. In 2001, a preseason game between Philadelphia and Baltimore was canceled due to turf problems at Veterans Stadium. Similar turf concerns prompted the league to cancel the 2016 Hall of Fame Game at the last minute. The 2017 Cowboys-Texans preseason game, originally scheduled for Houston, was at first switched to Arlington due to the flooding spawned by Hurricane Harvey in southeast Texas. The day prior to the scheduled game, it was cancelled to allow the Texans, who departed Houston the previous Friday to play at New Orleans and then were diverted to Dallas/Fort Worth after the game vs. the Saints, to return to Houston. And the COVID-19 pandemic caused the league to cancel the whole 2020 preseason.
Prior to the commencement of the NFL International Series, the NFL had another "featured" exhibition game called the American Bowl. This matchup was an extra exhibition game for the two teams involved and was often played on the same weekend as the Hall of Fame Game. It was played outside the United States, usually in Mexico or Japan. The American Bowl was held from 1986 to 2005; similar international matches had occurred regularly since 1969.
In addition, teams previously played home games at stadiums on the fringes of their markets or in markets not currently served by NFL teams. The Alamodome in San Antonio hosted games in this fashion, as did Rogers Centre (as part of the Bills Toronto Series), with Camp Randall Stadium, the on-campus home of Wisconsin Badgers football in Madison, Wisconsin, hosting one preseason Green Bay Packers game per year until the late 1990s. The Citrus Bowl was previously a common venue for games. The Carrier Dome in Syracuse, New York has been mentioned as a potential site for such a game, with the host team not yet mentioned.
In June 2019, the Green Bay Packers and Oakland Raiders announced that they would play a preseason game at Investors Group Field in Winnipeg, Manitoba, home of the Canadian Football League's Winnipeg Blue Bombers, on August 22, 2019. The game was originally proposed for Regina, Saskatchewan's Mosaic Stadium, but its CFL tenant rejected the proposal, fearing that they couldn't convert the field back to its Canadian football configuration (which uses a longer field than the NFL) in time for a game the next day. Due to the anchor points for the regular Canadian goalposts being within the NFL field and the concrete pad covering it being deemed a safety hazard by the teams, it was decided near game time to play the game on a reduced 80-yard field without kickoffs, making the 10 yard-line the actual goal line for the game (though field goals and PAT attempts were still allowed).
Also in 2019, the Dallas Cowboys and Los Angeles Rams announced that they would play a preseason game at Aloha Stadium in Hawaii on August 17 (marking the first NFL game held there since the 2016 Pro Bowl).
While selected preseason games are televised nationally by the NFL's main broadcast partners (including, most prominently, the Hall of Fame Game, which has been part of the Sunday Night Football package outside of Summer Olympics years -- where the game is usually aired by ESPN or NFL Network due to NBC's coverage of the Games), the majority of them are in-house productions of the individual teams, often in association with a local television broadcaster, regional sports network, or an outside producer such as Raycom Sports. Especially if a team's flagship station is affiliated with or owned by one of the NFL's network partners, rightsholders may also subcontract with their respective sports department or co-owned regional sports networks, such as CBS Sports (in the case of the Atlanta Falcons, whose flagship is CBS-owned The CW affiliate WUPA),Fox Sports Networks (in the case of the Detroit Lions, whose games are aired by WJBK and produced by then-sister Fox Sports Detroit), or NBC Sports (in the case of the New York Giants) to provide resources such as camera crews and graphics, or produce the entire broadcast, giving those networks their own ability to evaluate their production teams and the chemistry of network announcing teams before the season starts.
Preseason broadcasts are typically syndicated to a network of stations within the team's market region, which also typically includes a package of team-produced programming throughout the season (such as analysis and coach's shows), local rights to games broadcast on cable, and the right to brand themselves as the "official" station of the team in the market.
Exhibition games are almost exclusively played at night due to hot summer weather, and are frequently scheduled based on local convenience. When applicable, the NFL blackout restrictions apply, although stations are allowed to play the game on a tape delay if the game does not sell out (unlike the regular season policy, when rights revert to NFL Films). However, the blackout restrictions have never been applied since 2015 as a result of a passed vote during the league's owners' meeting in March in which the league, as an experiment because no regular season games in the 2014 season were blacked out and an FCC vote in September 2014 to no longer enforce blackouts, eliminated blackout rules for at least the last two seasons. Many more exhibition games fail to sell out than do regular-season games.
Currently, every NFL team requires its season ticket holders to purchase tickets at full price for two exhibition games as a requirement to purchase regular-season tickets. Complaints regarding this policy have gone all the way to the U.S. Supreme Court, but have failed to change the policy. A judgment in 1974 stated: "No fewer than five lawsuits have been instituted from Dallas to New England, each claiming that the respective National Football League (NFL) team had violated the Sherman Act by requiring an individual who wishes to purchase a season ticket for all regular season games to buy, in addition, tickets for one or more exhibition or preseason games."
Additionally, some players, coaches, and journalists, and numerous fans, object to the 4-week exhibition schedule. Players have little monetary incentive to play in exhibitions, since they are paid only a training-camp per diem for these games. Their salaries do not begin until the regular season, and thus they are essentially playing in exhibitions "for free". Regardless of these objections, owners continue to endorse the four-game exhibition season. The games are an easy source of revenue, and thus are unlikely to be dispensed within the foreseeable future.
In 2008, NFL commissioner Roger Goodell raised the possibility of shortening the exhibition season, in favor of lengthening the regular season. There was a possibility that by 2012, the league would switch to two primary exhibition games (down from 4) and an 18-game regular season (up from 16). Reasons cited were solutions to future labor concerns about revenue, and the overall dissatisfaction with the exhibitions among players and fans. Also, since the NFL is now widely considered a competitive year-round business, veteran players normally train and condition year round, and do not need the extensive exhibition season to get back into playing shape after the previous regular season. This proposal was eventually rejected in negotiations for the NFL Collective Bargaining Agreement, due to objections and concerns over fatigue and injuries raised by the National Football League Players Association.
Another proposal said to be gaining "growing sentiment among NFL owners" as of 2016 is a proposal to eliminate the last preseason game and give a league-wide bye week leading into the regular season.
Come 2021, the Competition Committee's deciding to reduce the preseason to three games per team, with the exception of two teams that compete in the Hall Of Fame Game, who'll play four. Plus, overtime may be eliminated, meaning those games could be using NCAA-style overtime periods.
On June 10, 2020, the NFL Network reported that the NFL and the NFL Players Association were discussing plans to shorten or even eliminate the scheduled four-game pre-season, after off-season activities had been disrupted by the COVID-19 pandemic. On June 25, the 2020 Pro Football Hall of Fame Game (scheduled for August 6) was canceled along with the 2020 Hall of Fame induction ceremony. On July 1, 2020, various media outlets reported that the league had decided to reduce the pre-season schedule to two weeks, by canceling Weeks 1 and 4, and changing a few fixtures to make sure every team played one home & road game each. The regular season would start as originally scheduled on Thursday, September 10, 2020. The NFLPA voted July 3 to push for the elimination of the 2020 preseason entirely, with extended isolated practice sessions replacing the games. On July 21, 2020, a week before the scheduled opening of training camp, the NFLPA told its members that the league had decided to cancel all preseason games.