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A portable app is a computer program that you can carry around with you on a portable device and use on any Windows computer. When your USB thumbdrive, portable hard drive, iPod or other portable device is plugged in, you have access to your software and personal data just as you would on your own PC. And when you unplug, none of your personal data is left behind.

A portable application is a software program that you can carry around with you on a portable device, such as a USB flash drive and use on any computer without necessarily modifying that computer's hard disk.