Triode, MOS Tube, and Transistor are all types of electronic components used for amplification and switching purposes. Triode is a three-terminal device that controls the flow of current between its electrodes. MOS Tube, also known as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), is a type of transistor that uses a metal-oxide-semiconductor structure to control the flow of current. Transistor is a semiconductor device that amplifies or switches electronic signals and is widely used in various electronic circuits.