Y Combinator is a startup fund and program for entrepreneurs. Since 2005, YC has invested in over 3,000 companies including Airbnb, Dropbox, Stripe, Reddit, Instacart, DoorDash and Coinbase. YC has built programs that support founders throughout the life of their company, from learning how to start a company, to finding customers, to raising funding and hiring their first employees, to raising a Series A and scaling beyond.