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It’s like they have a wall around them and they cannot get out of the enclosed area.

Bad apps might try to change files and settings on the computer, but they’re blocked. If software is run in a sandbox, then the damage they can do is limited. If a downloaded program is run in Windows in the normal way, then it has the power to do anything, such as infect the system with malware, encrypt your files, access personal information and leak information to third parties on the internet. If you download software from the internet, it might look okay from the description on the web page, but you won’t really know it’s safe until you run it and try it. The reason why this is so useful is for security purposes. An application running in a sandbox has limited access to the outside environment of Windows and the hard drive, and often no access at all. It’s a software technique that creates a safe area, where applications can run without causing any lasting damage to the rest of the system. Sandboxing on your PC works in the same way.

Sandboxed web browser