Y Combinator provides seed funding for startups. Seed funding is the earliest stage of venture funding. It pays your expenses while you’re getting started.
Some companies may need no more than seed funding. Others will go through several rounds. There is no right answer; how much funding you need depends on the kind of company you start.

At Y Combinator, our goal is to get you through the first phase. This usually means: get you to the point where you’ve built something impressive enough to raise money on a larger scale. Then we can introduce you to later stage investors—or occasionally even acquirers.