'Drought' occurs when no rain fall for a long period of time.
A drought is a long, extended period when the weather becomes really dry and there is no or inadequate amount of rain experienced in a region.
Drought has adverse effects on the area experiencing it such as prolonged shortage of water supply. depletion of ground water and damage to the crops.
The main reasons of drought are reported to be natural, including the air circulation and weather patterns, therefore water is encouraged to be saved in order to combat drought.