What is the difference between reservoirs, dams, hydropower stations and water control projects?

Water conservancy hub: A water conservancy project contains many buildings, which play a series of functions together, and are called hubs. It may include reservoirs, dams, power plants, fishways, waterways, spillways and so on. The concept is the widest.

Dam: a building that blocks water.

Reservoir: A reservoir formed by water intercepted by a dam.

Hydropower station: strictly speaking, it is a power station project that uses hydropower to generate electricity. Usually, a hydropower hub with power generation as the main body is called a hydropower station.