Force.com Projects

A Force.com Project allows you to read and write code, user interfaces, and other metadata
objects within a Force.com organization from your local computer.Although this
metadata is edited locally, it must be deployed to the Force.com service to run. Deployment
to Force.com occurs automatically every time you make a modification to an object
in a Force.com Project and save the changes.

Note

Force.com does not provide its own integrated source control system, but Force.com Projects
can be integrated into your company’s source control system through the built-in Team
features of Eclipse. Refer to the Eclipse documentation for more information.