Apple has integrated full-disk encryption into the Mac OS X operating system. Apple calls this feature "FileVault."
To check if encryption is enabled on your Mac, first open System Preferences:
Then open the Security and Privacy panel.
Finally, click on the FileVault tab.
In the example above, encryption is NOT enabled. Please do not enable encryption on your own; work with an IT staff member to do so as the encryption security key must be properly escrowed.