To start the discussion of discussion of difference between forward biasing and reverse biasing, first of all let us discuss the meaning of PN junction diode and biasing:

 The combination of the p-type material or semi-conductor with the n-type semi-conductor results in a PN junction Diode.

 Biasing: The biasing of a diode means to make junction operative. In other words biasing means to connect an external to pn junction diode. The battery can be connected by two methods, one is known as forward biasing and second is known as reverse biasing. Let us discuss them one by one:

1.         Forward Biasing

In case of forward biasing, the P side of the pn junction is connected to the positive terminal and N-side to the negative terminal of the battery or voltage source. When the voltage increases, then the depletion layer starts decreasing (depletion layer will be discussed in next article, here I can just say that it means that layer which is depleted from charge carriers).

2. Reverse Biasing

In case of reverse biasing, the P side of the pn junction is connected to the negative terminal and N-side to the positive terminal of the battery or voltage source.

This is the difference between forward biasing and reverse biasing.