The Volga Tatars or simply Tatars (Tatar: татарлар, romanized: tatarlar; Russian: татары, romanized: tatary) are a Turkic ethnic group native to the Volga-Ural region of western Russia, and contains multiple subgroups. Tatars are the second-largest ethnic group in Russia after ethnic Russians. They are primarily found in Tatarstan, where they make up 53.6% of the population. Their native language is Tatar, and are primarily followers of Sunni Islam.
"Tatar" as an ethnonym has a very long and complicated history, and in the past was often used as an umbrella term for different Turkic and Mongolic tribes. Nowadays it mostly refers exclusively to Volga Tatars (known simply as "Tatars"; Tatarlar), who became its "ultimate bearers" after the founding of Tatar ASSR (1920–1990; now Tatarstan). The ethnogenesis of Volga-Ural Tatars is still debated, but their history is usually connected to the Kipchak-Tatars of Golden Horde (1242–1502), and also to its predecessor, Volga Bulgaria (900s–1200s), whose adoption of Islam is celebrated yearly in Tatarstan. After the collapse of the Golden Horde, ancestors of modern Tatars formed the Khanate of Kazan (1438–1552), which lost its independence to Russia after the Siege of Kazan in 1552.