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Regarding this, what is a reverse biased diode?

Reverse bias usually refers to how a diode is used in a circuit. If a diode is reverse biased, the voltage at the cathode is higher than that at the anode. Therefore, no current will flow until the electric field is so high that the diode breaks down.

Furthermore, what is forward and reverse bias? Forward biasing means putting a voltage across a diode that allows current to flow easily, while reverse biasing means putting a voltage across a diode in the opposite direction. The voltage with reverse biasing doesn't cause any appreciable current to flow.

Furthermore, what is the use of reverse bias?

When the diode is reverse biased, the electric field due to the battery and the electric field of the depletion region are in the same direction. This makes the electric field even stronger than that before reverse bias was applied.

What happens when a pn junction diode is reverse biased?

When a p-n junction is reversed biased, the negative terminal of the battery attracts the free holes in the p-type towards itself whereas the positive terminal attracts the free electrons in n-type towards itself.