Tatar language different from Crimean Tatar
Central or Middle (Kazan)
Western (Mişär or Mishar)All of these dialects also have subdivisions. Significant contributions to the study of the Tatar language and its dialects, were made by a scientist Gabdulkhay Akhatov, who is considered to be the founder of the modern Tatar dialectological school.
Spoken idioms of Siberian Tatars, which differ significantly from the above two,  are often considered as the third dialect group of Tatar by some, but as an independent language on its own by others.Central or Middle
The Central or Middle dialectal group is spoken in Kazan and most of Tatarstan and is the basis of the standard literary Tatar language. Middle Tatar includes the Nagaibak dialect.Siberian Tatar
Two main isoglosses that characterize Siberian Tatar are ç as [ts] and c as [j], corresponding to standard [ɕ] and [ʑ]. There are also grammatical differences within the dialect, scattered across Siberia.Many linguists claim the origins of Siberian Tatar dialects are actually independent of Volga–Ural Tatar; these dialects are quite remote both from Standard Tatar and from each other, often preventing mutual comprehension. The claim that this language is part of the modern Tatar language is typically supported by linguists in Kazan, Moscow and by Siberian Tatars linguists and denounced by some Russian and Tatar ethnographs.
Over time, some of these dialects were given distinct names and recognized as separate languages (e.g. the Chulym language) after detailed linguistic study. However, the Chulym language was never classified as a dialect of Tatar language. Confusion arose because of the endoethnonym "Tatars" used by the Chulyms. The question of classifying the Chulym language as a dialect of the Khakass language was debatable. A brief linguistic analysis shows that many of these dialects exhibit features which are quite different from the Volga–Ural Tatar varieties, and should be classified as Turkic varieties belonging to several sub-groups of the Turkic languages, distinct from Kipchak languages to which Volga–Ural Tatar belongs.History
Tatar's ancestors are the extinct Bulgar and Kipchak languages.
The literary Tatar language is based on the Middle Tatar dialect and on the Old Tatar language (İske Tatar Tele). Both are members of the Volga-Ural subgroup of the Kipchak group of Turkic languages, although they also partly derive from the ancient Volga Bulgar language.
Most of the Uralic languages in the Volga River area have strongly influenced the Tatar language, as have the Arabic, Persian and Russian languages.Crimean Tatar, although similar by name, belongs to another subgroup of the Kipchak languages. Unlike Kazan Tatar, Crimean Tatar is heavily influenced by Turkish (mostly its Ottoman variety with Arab and Persian influences) and Nogai languages.