The first commercially available television was the RCA TRK-12, introduced in 1939. It featured a 12-inch screen and used a cathode ray tube to display images. This television was showcased at the New York World's Fair, marking a significant milestone in broadcasting technology. The RCA TRK-12 was sold to the public for around $600, which was a substantial amount at the time. It allowed viewers to watch live broadcasts, paving the way for the future of home entertainment and the growth of the television industry.