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Scrum is an agile way to manage a project. Instead of planning everything up front, Scrum teams plan and deliver a product iteratively. Scrum iterations are called "sprints" and typically last 2 weeks (some teams standardize on 3 or 4 weeks, and some go for 1-week sprints).
Compared to traditional project management or waterfall, Scrum typically has less documentation, more customer and team collaboration, more frequent releases, and regular events to facilitate team process improvements.
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