Scrum is a popular framework for Agile software development that emphasizes frequent communication, collaboration, and transparency, and is characterized by short, time-boxed iterations called sprints. Scrum teams use a backlog of work items, known as user stories, to plan and prioritize their work. The framework also includes a prescribed set of ceremonies, such as sprint planning, daily scrum meetings, sprint reviews, and retrospectives, to help teams stay on track and continuously improve.