CRTs or cathode ray tubes are a type of electronic display used in older television and computer screens. There are a few different synonyms for this term, including "picture tubes," "tube displays," and "vacuum tube displays." These terms all refer to the same type of technology, which uses an electron gun to project an image onto a phosphorescent screen. Although CRTs have largely been replaced by newer LCD and LED displays, they are still used in some specialized applications, such as medical equipment and some types of industrial displays. Despite their decreased popularity, the terminology surrounding CRTs remains relevant for those working with older technology or maintaining legacy equipment.