Question

define resrvoir in short​

Answer 1

A reservoir (from French réservoir – a "tank") is, most commonly, an enlarged natural or artificial lake, pond or impoundment created using a dam or lock to store water. ... Defined as a storage space for fluids, reservoirs may hold water or gasses, including hydrocarbons.

Answer 2

A reservoir is something which is used to store water or food which can be used in unfavorable conditions for survival
Reservoir are storage bodies