A startup accelerator is a program designed to support early-stage companies through mentorship, resources, and funding. These programs typically last a few months and culminate in a "demo day," where startups present their business ideas to potential investors. Accelerators often provide a structured curriculum that helps entrepreneurs refine their business models and develop their products. Participants in startup accelerators usually receive seed funding in exchange for equity in their company. Notable examples of startup accelerators include Y Combinator and Techstars, which have helped launch many successful companies. These programs foster innovation and entrepreneurship in various industries.