Scrum is a framework for managing complex projects that emphasizes lightweight processes, self-organizing teams, accountability, and iterative improvements. It uses sprints, daily stand-up meetings, product backlogs, and kanban boards to help teams deliver value continuously. While simple to understand, scrum can be difficult to master and requires core values of focus, commitment, openness, respect, and courage from team members. Tools like Trello and Jira can help teams implement scrum processes and track progress using kanban boards.