CCleaner is a tool for improving system efficiency by cleaning up files, fixing registry errors, and managing system startup. It deletes cache, temp files, browser history, restore points, and duplicate files to free up space. CCleaner features a registry cleaner, uninstaller for apps, and a free space eraser. Ideal for anyone looking to clean their PC and improve overall system performance. CCleaner had a past security incident but current versions are secure with regular updates.

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