Software Development Life Cycle (SDLC) is a systematic process for planning, creating, testing, and deploying software applications. The SDLC includes several phases: requirement analysis, design, development, testing, deployment, and maintenance. Following a structured SDLC ensures that software projects are completed efficiently, meet quality standards, and fulfill user requirements. Various methodologies, such as Agile and Waterfall, are used within the SDLC framework to guide development.