Imagine a basement.
Everytime you need to store something you just drop it where you see a free space. everything is mixed. The Christmas decorations are over there, the Christmas tree is behind the door. The tires are here and the car toolbox is somewhere overthere.
Defragmenting is gathering all relevent item together. All decorations on the decorations shelf. most often used are moved neer the entrance. It is easier to sort everything if you still have some free room to navigate.
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