The software development life cycle (SDLC) is a structured process used to design, develop, and maintain software applications. It typically consists of several phases, including requirements gathering, design, coding, testing, and deployment. Each phase has specific tasks and deliverables that help ensure the final product meets user needs and quality standards. After deployment, the SDLC also includes maintenance to address any issues or updates needed for the software. This cyclical approach allows developers to refine and improve the software over time, ensuring it remains relevant and functional in a changing environment.