Y Combinator, LLC is a renowned American technology startup accelerator and venture capital firm, founded in March 2005. Over the years, it has played a pivotal role in launching more than 5,000 companies.

Y Combinator provides seed funding, mentorship, and resources to early-stage startups, helping them grow and succeed. Some of its most notable alumni include Dropbox, Airbnb, Stripe, and Reddit1. The firm is known for its biannual accelerator programs, which culminate in Demo Day, where startups present their progress to a room full of investors.

Y Combinator has expanded its reach into various sectors, including biotech, healthcare, and artificial intelligence, continually adapting to the evolving landscape of technology and innovation2. The firm is headquartered in Mountain View, California, and has become a cornerstone of the startup ecosystem, fostering innovation and entrepreneurship globally.