Uzbek is a Karluk Turkic language spoken by Uzbeks. It is the official and national language of Uzbekistan and formally succeeded Chagatai, an earlier Karluk language endonymically called Türki or Türkçe, as the literary language of Uzbekistan in the 1920s.
According to the Joshua Project, Southern Uzbek and Standard Uzbek are spoken as a native language by more than 34 million people around the world, making Uzbek the second-most widely spoken Turkic language after Turkish. There are about 36 million Uzbeks around the world, and the reason why the number of speakers of the Uzbek language is greater than that of ethnic Uzbeks themselves is because many other ethnic groups such as Tajiks, Kazakhs, Russians who live in Uzbekistan speak Uzbek as their second language.