If there can be considered a consensus within the dialectology of Hindi proper, it is that it can be split into two sets of dialects: Western and Eastern Hindi.Western Hindi evolved from the Apabhramsa form of Shauraseni Prakrit, Eastern Hindi from Ardhamagadhi.
Western Hindi languages. Clockwise from the top: Hindustani, Kannauji, Bundeli, Braj, Haryanvi. The Eastern Hindi languages are not shown individually. They are Awadhi in the north, east of Hindustani and Kannauji; Bagheli in the center, to the east of Bundeli, and Chhattisgarhi to the southeast of Bundeli.
This analysis excludes varieties sometimes claimed for Hindi for cultural reasons, such as Bihari, Rajasthani, and Pahari.Bhojpuri is classified under the Bihari languages though it has long been considered a Hindi language.
Urdu is the official language of Pakistan. Although only the native language of 7% of the population, it is nearly universal as a second language among the literate.
Bombay Hindi ("Bombay Baat"), the dialect of the city of Mumbai (Bombay); it is based on Hindustani but heavily influenced by Marathi. Technically it is a pidgin, i.e. neither is it a native language of any people nor is it used in formal settings by the educated and upper social strata. However, it is often used in the films of Hindi cinema (Bollywood) because Mumbai is the base of the Bollywood film industry.
The Delhi Hindustani pronunciations [?:, ?:] commonly have diphthongal realizations, ranging from  to  and from [?u] to [?u], respectively, in Eastern Hindi varieties and many non-standard Western varieties. There are also vowel clusters /?i:/ and /?u:/.