Understanding the seven steps of the SDLC is essential for software developers. Learn the steps and important SDLC development models. The Software Development Life Cycle ( SDLC ) is a process used by software development organizations to plan, design, develop, test, deploy, and maintain software applications. SDLC guides teams to plan, build, test, and deliver software . Discover phases, KPIs, tools, and checklist with our quick start guide.