1. revert selected files back to a previous state
2. revert the entire project back to a previous state
3. compare changes over time
4. see who last modified something that might be causing a problem
5. see who introduced an issue and when, and more
6. Using a VCS also generally means that if you screw things up or lose files, you can easily recover.

1. help to restrict the accessibility (scope) of a class, constructor, variable, method or data member.
2. specify which classes can access a given class and its fields, constructors and methods.
   sometimes referred to in daily speech as Java access specifiers.
3. can be specified separately for a class, its constructors, fields and methods.
4. Assigning an access modifier to a class, constructor, field or method
   is also sometimes referred to as “marking it as modifierName”.

   E.g., “marking the method as public”.

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