Y Combinator (YC) is one of the most influential startup accelerators in the world, renowned for its role in shaping the modern startup ecosystem. Founded in 2005 by Paul Graham, Jessica Livingston, Robert Morris, and Trevor Blackwell, YC pioneered the concept of a structured accelerator program, providing seed funding, mentorship, and access to a vast network of investors and experts. Twice a year, YC hosts a batch program where selected startups participate in an intensive three-month journey. The program is designed to help founders refine their ideas, develop their products, and navigate the complexities of starting and scaling a company. Startups in the YC program receive initial funding, typically in exchange for a small equity stake, as well as invaluable guidance from seasoned entrepreneurs and industry leaders. YC is also known for its Demo Day, where startups pitch their ideas to a room full of potential investors, providing unparalleled exposure and opportunities for funding.

YC has been the launchpad for many of the world's most successful tech companies, including Dropbox, Airbnb, Stripe, Reddit, and Instacart, among others. Beyond its financial support, YC has built a vibrant and supportive community of alumni who often collaborate, share insights, and mentor new startups in the ecosystem. Its unique approach focuses on empowering founders by teaching them how to think critically about their business and prioritize growth. Over the years, YC has expanded its initiatives to include Startup School, a free online program open to entrepreneurs globally, and YC Continuity, a growth-stage fund to support companies beyond their early stages. This holistic approach has solidified YC’s position as a leader in fostering innovation and entrepreneurship, with its influence extending far beyond Silicon Valley to shape the global startup landscape.