Scrum is a methodology with a set of principles and a process to improve delivery. In software development, Scrum is one of the most popular frameworks applying the principles of agile. It includes a set of Scrum ceremonies and roles to support the process. The goal is to improve communication, teamwork and speed of development. Sprints, Scrums (or stand-up meetings), Retrospectives, backlogs, and burndowns are all parts of Scrum.
Read more about Scrum in our post on project management methodologies.