Diodes are I believe to be one of most simple components on electrical circuit, A diode is like a one way road cars can go in one direction only, but cant go to the opposite direction. A "Do Not Enter" sign serves as barrier for them.
Diodes in more techincal sense is two terminal device. Diodes redicrect current from postive terminal to negative and cureent can't flow in opposite direction. Diodes are useful in a circuit because diodes amplify current within a circuit.
That's all there is to a diode there is to a diode.





