Briefly describe electron and hole motions in a p-n junction for forward and reverse biases

In a forward bias, the p-type is connected to the positive side of the terminal and the n-type is connected to the negative terminal of the voltage source. The electrons in the n-type junction travels towards the holes in the p-type junction

In a reverse bias, the junctions are connected to the opposite terminals compared to the forward bias. The free electrons build up on the center creating a neutral layer that widens as voltage is increased.