A CRT TV, or cathode ray tube television, is an older type of television that uses a large glass tube to display images. Inside the tube, electrons are fired at a phosphorescent screen, creating pictures by lighting up different colors. CRT TVs were popular from the 1950s until the early 2000s. These televisions are bulky and heavy compared to modern flat-screen models like LCD or LED TVs. While they provided good picture quality for their time, advancements in technology have led to the decline of CRT TVs in favor of slimmer, more energy-efficient options.