There are four types of startup funding rounds: seed round, series A round, series B round, and series C round. A seed round is the first type of funding that a startup raises from investors. A series A round is the first significant round of financing after a startup has completed its seed round. A series B round is the second significant round of financing after a startup has completed its series A round. And a series C round is the third significant round of financing after a startup has completed its series Bround.