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You're presumably using Windows. Microsoft keep sending updates to Windows, which take up space on your C: drive.
These updates are some combination of bug & security fixes, which you probably want, and "new features" (like embedded advertising) that you might not.
Whenever you restart (or let Windows restart itself if it's been nagging you), the updates it downloaded in the background are applied, but the old version (of whatever was updated) is kept around in case the update breaks something.
useless
Thanks, but again, way beyond my understanding. Try imagining someone who doesn't know what a bottom bracket is, or even a tyre lever, or how a quick release on a wheel works.