A monitor is a piece of electrical equipment which displays images generated from the video output of devices such as computers, without producing a permanent record. Most newer monitors typically consist of a [TFT-LCD](thin film transistor liquid crystal display) with older monitors based around a cathode ray tube (CRT). Almost all of the mainstream new monitors being sold on market now are LCD. The monitor comprises the display device, simple circuitry to generate and format a picture from video sent by the signals source, and usually an enclosure. Within the signal source, either as an integral section or a modular component, there is a display adapter to generate video in a format compatible with the monitor.