What is a reservoir for?

Answer:
Generally to hold liquids.
Like a Windshield washer or brake fluid reservoir.
But also to hold things like a "Vacuum" (yes I know a vacuum does not exists but That's what the car manufacturers call it)
First answer by Sidewaysrob. Last edit by Sidewaysrob. Contributor trust: 105 [recommend contributor recommended]. Question popularity: 2 [recommend question].