Agile and waterfall are two different approaches to software development and other kinds of work: Agile follows an iterative and incremental process, where the project is divided into small and time-boxed iterations, where the team works on a prioritized list of features and delivers working software at the end of each iteration. Waterfall is a traditional approach that follows a linear and sequential process, where the project is divided into phases, such as analysis, design, development, testing, and deployment, and each phase is completed before moving to the next one.