Yes. It's true: the string quartet (violin 1, violin 2, viola, cello) plays string quartets (usually multi movement works scored for violin 1, violin 2, viola, cello).
Learn more about the string quartet, including its origins in the baroque trio sonata (the what? and, evolution in the hands of Haydn, Mozart and Beethoven into one of the most important classical music genres. Listen to string quartets! This is a great link: check it out! https://courses.lumenlearning.com/musicapp_historical/chapter/string-quartet/