# Concepts

How Offloft moves, checks and serves your files, and why it works the way it does.

- [How verification works, in short](https://www.offloft.com/docs/how-verification-works): The short version of what Offloft checks in your bucket before your site uses a file.
- [File states](https://www.offloft.com/docs/file-states): What each status on a file means, and which copy your site serves in that state.
- [Issues and fixes](https://www.offloft.com/docs/issues-and-fixes): How Offloft reports problems, what the fix buttons do, and when to ignore an issue.
- [Jobs](https://www.offloft.com/docs/jobs): Offload, verify, re-sync and bring everything back, in the background with pause and cancel.
- [How URLs are served](https://www.offloft.com/docs/how-urls-are-served): Offloft changes media addresses as pages are shown, so normal offloading doesn't change your database.
- [What happens when you deactivate or delete Offloft](https://www.offloft.com/docs/deactivate-or-delete): What stays, what stops, and what happens to your bucket when you turn Offloft off or remove it.