The point-contact transistor was however rather big, compared with today's transistors, and difficult to produce in large scale. The most used transistor of today is therefore of a diffent kind. It is called a field-effect transistor or FET for short. There are several kinds of FETs today and the one we are going to look at is called metal-oxide semiconductor field-effect transistor (MOSFET). The basis for the function of the different FETs is however the same.