The AppData folder is one of the hidden folders on the Windows operating system. It stores application data for many programs, including Firefox, Skype or Adobe, but also those by Microsoft and Windows. This includes templates, system start-up elements, short notes, signatures, add-ons for various programs, and many more. It may also contain data of the currently registered user, as well as saved progress for computer games.
The Windows AppData folder has three subfolders containing the following:
- Roaming: This stores settings that are carried over (called roaming) when signing into other computers in company networks.
- Local: This subfolder stores data that does not roam, such as temporary data.
- LocalLow: This is the storage location for Windows/program folders with highly restricted rights, for example browser add-ons.
Huge quantities of files can sometimes accumulate in these folders. The temporary files in the Local subfolder can be deleted to free up storage space on the system hard drive. However, the disk cleanup by Windows does not perform this process. So, it has to be done manually.