Version-controlled software?

What is version-controlled software? What is it for? What is the trunk? What is a branch? Describe the main operations (commit, merge, check in, check out).
List some DOs and DON'Ts when doing a peer review.
Briefly describe the Scrum process of the Agile technique, and indicate its potential advantages and disadvantages.
Make sure that you list your sources of references.

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