The purpose of a software development lifecycle (SDLC) is to provide a structured process for planning, creating, testing, and deploying software applications. The SDLC encompasses various stages, including requirement analysis, design, implementation, testing, deployment, and maintenance. By following a systematic approach, teams can produce high-quality software that meets user requirements and adheres to project timelines. The SDLC also facilitates better communication among stakeholders, ensures efficient resource allocation, and reduces risks associated with software development. Ultimately, a robust SDLC contributes to successful project outcomes and long-term software viability.