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Why are there directories called Local, LocalLow, and Roaming under \Users\<username>?

What is folder C:\Users\abc\AppData used for in Windows and particularly Windows 7? I have lot of old data in C:\Users\abc\AppData\Roaming, is it safe to delete it?

Is this data useful, if not why is not cleaned up by the system itself?

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marked as duplicate by Tom Wijsman, KronoS, slhck Sep 18 '12 at 7:47

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The AppData folder contains those portions of your user-specific system and program configuration data that are not stored in the registry. So, no, it most certainly is NOT safe to delete the folder. Leave it alone unless you know what you're doing.

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