A portable app is software that runs directly from its own folder without a system installation: it does not write to the registry or system directories, and it stores its settings next to the program files. You can copy it to a USB drive and run it on another computer.
Why it matters
Portable apps are handy on shared or locked-down computers where you cannot install software, and for keeping a tested configuration with you. They leave little behind on the host system and are easy to back up, since everything lives in one folder. The downsides are no automatic updates in many cases and fewer system integrations such as file associations.
Example
Downloading the ZIP version of a program such as 7-Zip or Notepad++, extracting it to E:\Tools\Notepad++\ and launching notepad++.exe works from the stick on any compatible Windows PC. On Linux, an AppImage is a similar single-file portable format; on macOS many apps run from any folder.
Common mistakes
- Running portable tools from untrusted sources, which defeats the safety of avoiding an installer.
- Forgetting that settings stay in the folder, so deleting it removes them.
- Assuming it works on any OS; a Windows portable app still needs Windows.
Related
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