The application development life cycle (ADLC), also known as the software development life cycle (SDLC), is a comprehensive process that guides the creation of applications from initial requirements gathering to deployment, testing, and ongoing maintenance. This framework is essential for ensuring that applications meet user needs while managing potential risks and includes six main phases: discovery, design, development, quality assurance, release, and maintenance. Various models are used to implement the ADLC, such as the waterfall, agile, V-shaped, iterative, spiral, and DevOps models, each with its own advantages and challenges. These models range from the traditional waterfall approach, which follows a sequential process, to the agile model, which is more flexible and iterative, and the DevOps model, which emphasizes collaboration between development and operations teams. Understanding and applying the appropriate model is crucial for successful application development, as it affects everything from project timelines to flexibility in addressing changing requirements.