Application of the diode is one of the most commonly used electronic semiconductor device.
Diode have many different types, and they are plays an important role in many of the circuit, it is one of the first born of the semiconductor element, it is widely used.

So, what is Diodes?

* A diode is lead to two electrodes by a PN junction, sealing the shell made of semiconductor devices.
* Diodes most obvious is that it's a one-way nature of the electrical properties. Diodes have two two electrodes, The Positive Electrode (Anode) and the Negative Electrode (Cathode)
* Diode according to the functions can be classified as: Switch, Rectifier, Regulator, Voltage Reference, Steady Flow, Variable Capacitance, Transient Voltage Suppression, Optical and Microwave, etc.
* Kingtronics produce and sell many different kinds of diodes and rectifiers, general purpose diode M7, 1N4007, 1N5408, switching diodes LL4148, zener diodes BZV55C, fast recovery diodes etc.
http://www.kingtronics.com/diodes-rectifiers/