This document provides an overview of startup accelerator programmes. It defines accelerators as programmes that typically offer pre-seed investment, focus on small teams rather than individuals, provide time-limited support over 3-6 months through programming and mentoring, and work with cohorts of startups. While accelerators can vary, this defines the core model born from Y Combinator. The document notes that accelerators differ from other incubation supports like angel networks, business competitions, co-working spaces, and entrepreneurship courses, which do not on their own constitute an accelerator. It aims to help readers understand accelerators and consider setting one up through framing key strategic choices and common practices.