The Software Development Life Cycle (SDLC) is a structured methodology used to develop high-quality software, comprising seven phases: Planning, Requirements Analysis, Design, Coding, Testing, Deployment, and Maintenance. Each phase serves a crucial role, from defining the software's purpose and scope to gathering user expectations, designing architecture, writing code, testing for bugs, deploying the software, and maintaining it for continual improvement. Various SDLC models, such as Waterfall, Agile, and RAD, cater to different project needs, with the choice of model depending on factors like flexibility and timeline. Harness optimizes the SDLC process by leveraging AI to automate tasks, provide data-driven insights, and ensure efficient and scalable software delivery. The Maintenance phase involves ongoing support and upgrades to adapt to users' evolving needs, while Continuous Delivery practices enable reliable software releases through automated processes.