Quick answer: Temporary files are short-term files used by Windows, browsers, installers, and apps. Most are disposable after the related work is finished.
Common examples
| Type | Why it exists |
|---|---|
| App temp files | Used while an app edits, exports, installs, or updates something. |
| Browser cache | Stores web files so pages can load faster later. |
| Windows update temp files | Used during update download, install, and rollback preparation. |
| Thumbnails | Speeds up folder previews for pictures and videos. |
When they are safe to delete
Temporary files are usually safe to delete after closing apps, finishing downloads, and completing updates. Windows may skip files that are still in use.
When to wait
Wait if Windows Update is running, software is installing, a large export is active, or an app still has unsaved work.
When to use DiskTidy
DiskTidy is useful when you want to review temporary files and cache cleanup candidates locally before deleting selected items.
FAQ
What are temp files?
Temp files are temporary working files. They are not usually meant to be kept forever.
Do temporary files come back?
Yes. Windows and apps recreate temporary files as part of normal use.