Basically, every time you surf the web, download, upload, etc the computer needs to find somwhere to put it. When your computer is all spankingly brand new it puts it near the memory so that when it needs it its there, straight away. Over time it places all the stuff u do further and further away, hence slowing down ur pc. Think of a ball in the middle of a room then the room being full and stuff outside the room cuz theres no room left. Getting the ball would take much longer. So the Defragmentor grabs all the far away stuff and condenses it back all together!
You've learned something today! lol
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