This technical report discusses Metal Oxide Semiconductor Field Effect Transistors (MOSFETs). It introduces MOSFETs and compares them to JFETs. It then outlines the different types of MOSFETs including depletion MOSFETs (D-MOSFETs) and enhancement MOSFETs (E-MOSFETs). Key differences between D-MOSFETs and E-MOSFETs are explored.