Isn't it the role of a VC to give a company funding so they can get a big return on their investment later one when the company sells, or something along those

Isn't it the role of a VC to give a company funding so they can get a big return on their investment later one when the company sells, or something along those lines? I mean, isn't that something everyone expects when they get involved with a VC? Isn't that what they're for? Am I misunderstanding something here?