The primary function of a tech startup accelerator is to support early-stage startups in their growth and development. Accelerators provide a structured program that typically includes mentorship, funding, networking opportunities, and resources to help startups refine their business models and accelerate their market entry. They often culminate in a "demo day," where startups pitch their ideas to investors. By offering a supportive environment and access to industry expertise, accelerators increase the chances of success for budding entrepreneurs and innovative ideas.