TFT stands for Thin Film Transistor. These are a sub-type of LCD screens, rather than a separate entity; TFT type screens provide the highest resolution of all LCD screens. TFT monitors are sometimes called Active Matrix monitors; the other main kind of LCD technology is Passive matrix, which is lower quality, cheaper, and to my knowledge in lower use nowadays.
A TFT screen is an LCD screen. Some LCD screens use TFT technology, and some don't. TFT technology provides the best resolution of all the flat screen techniques, but is also the most expensive. TFT LCD screens are also called active matrix LCD screens.