Version Control

I am in an "Intro to C++" class and I am required to have a Version Control sheet to turn in with my program.  However, the book doesn't explain what version control is.  Can someone please tell me what they are asking for?
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Version control addresses the following areas:

Team coordination - making sure, by default, that only one person at a time is modifying a file. This prevents files from accidentally being replaced by another user's changes.

Version tracking - archiving and tracking old versions of source code and other files, which can be retrieved for bug tracking and other purposes.

Cross-platform development - tracking portability issues involved in maintaining one code base across multiple development platforms.

Reusable or object-oriented code -tracking which programs use which modules so that code can be reused.

You can find a number of Version Control systems, such as Microsoft Visual SourceSafe, PVCS, ...

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