Check this site out for many. There are more with other specialized diodes such as LED's (light emitting diodes).
A diode is an electronic component that allows current to move in one direction through the component.Applications of diodes are
One of the main application of diodes are it converts AC power to DC power.
Diodes steer current and make sure it only flows in the proper direction.
It acts as an protection device for sensitive electronic components.