A cathode ray tube television (CRT TV) is an older type of television that uses a large glass tube to display images. Inside the tube, a beam of electrons is directed towards the screen, which is coated with phosphorescent materials. When the electrons hit the screen, they create light and form the images we see. CRT TVs were popular from the mid-20th century until the early 2000s, when they were gradually replaced by flat-screen televisions like LCD and plasma models. Despite their bulkiness and weight, CRT TVs offered good color reproduction and fast response times for viewing moving images.