Scrum is one of the most popular frameworks for implementing agile. So popular, in fact, that many people think scrum and agile are the same thing. (They’re not.) Many frameworks can be used to implement agile, such as kanban for example, but scrum has a unique flavor because of the commitment to short iterations of work.
Related Articles:
https://www.atlassian.com/agile/scrum
http://www.scrumguides.org/docs/scrumguide/v2016/2016-Scrum-Guide-US.pdf#zoom=100
https://www.scrumalliance.org/community/articles/2013/november/an-introduction-to-scrum
