What is a reservoir?

Question

I have to do a project on it but I cant fing what it is in my book.

Answer 1

A pond or lake formed by a dam. It may be used for flood control, water source, power generation, wildlife values, or recreation.

Answer 2

The word refers generically to any container.

Mostly it refers to a lake created behind a dam, such as Lake Mead was created by building the Hoover Dam.

Answer 3

This can refer to a number of things, water air etc. From the name reserve, its where reserves are stored.