Before running any deep system optimization (like registry cleaning), use the built-in Windows System Restore feature. This ensures you can "go back in time" if a change causes instability. Conclusion
Rearranges fragmented data on traditional Hard Disk Drives (HDDs) to accelerate file access speeds. (Note: Defragmentation is automatically disabled for Solid State Drives (SSDs) to prevent unnecessary wear). 3. Privacy and Security Protection
The core component that removes junk files, temporary files, browser cache, and other clutter that hogs disk space.