Question

describe the process of electric discharge and lighting

Answer 1

When 2 clouds with unlike charges come near each other there can be a very huge discharge between them.huge energy is released in the form of heat ,light and sound during such type of discharge . This is called electric discharge or lightning which we see the light and the thunder which we hear as sound.

Hope this will help u.....

Answer 2

check out this link 

https://en.wikipedia.org/wiki/Lightning

Lightning is a sudden electrostatic discharge that occurs during a thunderstorm. This discharge occurs between electrically charged regions of a cloud (called intra-cloud lightning or IC), between two clouds (CC lightning), or between a cloud and the ground (CG lightning).