A CRT Monitor (or Cathode Ray Tube Monitor) is an analog computer display set with a large back and casing. They are older types of computer monitors rarely used today. They are very hard to get and are not in production anymore. They are usually worth £30 Now. Video quality is usually better on CRT Monitors
A TFT Monitor (Thin Film Transistor Monitor) is an LCD Display or flat panel displays. They take up much less space and they are used all the time! It is faster and more effective than a CRT and they take up less space. They are however, quite a bit more expensive with an average of about £110 to buy.The Video on a TFT Monitor is not always as good as a CRT.