Back to My Mac is an iCloud feature that becomes incredibly useful when you are working remotely from your office and need to get something done, or to help troubleshoot somebody else’s machine. The feature lets you connect to your Mac, AirPort Disk or Time Capsule using the Internet or another Mac.
What it does:
When you connect to your home Mac from a remote Mac you can copy files (and pretty much do anything you like to those files between both machines. You can also see a live version of the screen on the Mac you are accessing from the Mac you use, and can also control it as if you were using the computer. This extends to running apps on the office/home even though you do not have these installed on the Mac you use to access Back to My Mac. Finally you can change Settings on your AirPort Disk or Time Capsule with AirPort Utility 6.3 or later. (AirPort Base Stations shuld be running firmware version 7.6.1 or later to support Back to My Mac).
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Source: COMPUTER WORLD