What is a portable app?

A portable application (portable app) is a computer software program that runs from a removable storage device such as a USB flash drive, portable hard drive, flash card, or CD-ROM drive. Portable applications can be run on any computer system with which they are compatible but typically require a specific operating system such as Microsoft Windows XP or above. Portable software is typically designed to be able to store its configuration information and data on the storage media containing its program files and when you unplug the device, none of your personal data is left behind.