This document discusses the Defence and Security Accelerator, which aims to accelerate innovation in defence and security technologies. It provides funding for innovative ideas through competitive challenges and an enduring challenge process. The Accelerator uses a two-phased approach, with Phase 1 focusing on concept development and Phase 2 supporting prototype development. It assesses proposals based on their potential impact, likelihood of exploitation, innovation quality, and level of technical challenge. The Accelerator seeks to engage innovators from diverse backgrounds and provide support throughout the funding process.