Despite being nothing more than a simple two-pin semiconductor devices, diodes are vital to modern electronics. Some of their most common applications include turning AC to DC, isolating signals from a supply, and mixing signals. A diode has two 'sides' and each side is doped differently.

Why would a diode be useful in a circuit?

Diodes regulate the flow of current in a circuit

The simplest semiconductor component — the diode — performs a variety of useful functions related to its core purpose of managing the direction of the flow of electrical current. Diodes allow current to flow through them in one direction only.

In which devices diode is used?

Diodes can be used as rectifiers, signal limiters, voltage regulators, switches, signal modulators, signal mixers, signal demodulators, and oscillators. The fundamental property of a diode is its tendency to conduct electric current in only one direction.