an Agile software development methodology designed to improve software quality and responsiveness to changing customer requirements. As a type of Agile developmentAgile Development Agile development is a methodology that promotes continuous iteration of development and testing throughout the project's software development lifecycle. It advocates adaptive planning, evolutionary development, early delivery, and continual improvement, encouraging rapid and flexible response to change., XPExtreme Programming (XP) an Agile software development methodology designed to improve software quality and responsiveness to changing customer requirements. As a type of Agile development, XP advocates frequent "releases" in short development cycles, which improves productivity and introduces checkpoints where new customer requirements can be adopted. advocates frequent “releases” in short development cycles, which improves productivity and introduces checkpoints where new customer requirements can be adopted.