It helps optimize system performance by cleaning junk files, fixing registry issues, and managing startup items. CCleaner cleans a variety of files, including cache, temp files, browser history, duplicate files, and system restore points. Includes registry cleaner, uninstaller, and free space eraser. Perfect for anyone who wants to speed up their PC by removing junk files and fixing registry errors. CCleaner had a history of malware incidents but is now secure with updates.