The software development lifecycle (SDLC) is a framework that outlines the process for taking an app or website from concept to reality. It consists of seven steps: planning, requirement analysis, design, implementation, testing, deployment, and maintenance. No-code development simplifies this process by providing a visual drag-and-drop editor, AI-powered design, and full-stack functionality in a single package. This makes it easier for anyone to build software without needing extensive coding knowledge or resources.