It helps optimize system performance by cleaning junk files, fixing registry issues, and managing startup items. Offers a deep clean for cache, temp files, browser history, restore points, duplicates, and other unnecessary files. CCleaner features a registry cleaner, uninstaller for apps, and a free space eraser. Perfect for anyone who wants to speed up their PC by removing junk files and fixing registry errors. Although there was a past malware issue, recent versions of CCleaner are considered safe if kept updated.