What is a sprint in Scrum and how long does it last?

A sprint is a fixed-length iteration, typically two to four weeks, during which the Scrum team creates a potentially shippable product increment. Each sprint begins with sprint planning where the team selects items from the product backlog and creates the sprint backlog. Daily standups, or daily scrums, provide brief synchronization. At the end, the sprint review demonstrates completed work to stakeholders for feedback, and the sprint retrospective examines the team's process for improvement. Sprints are timeboxed, meaning they do not extend if work is unfinished.