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Think of each file on your disk as a stack of papers. However the papers aren't all together, but all over your hard disk. So when a particular file is accessed, it might get one part of it (e.g.one page of the paper) at the start of the hdd, and 3 parts in the middle... and another 1 a bit after that..so as you can see file access could be faster if the pages were all together.
Defragging, gets the fragments of the file and puts them all together consecutively as best as it can. So things will be faster. It also helps reduce fragmentation occuring.
When you're defragging, close all other programs, and dont touch your computer, then it'll do it as fast as it can.
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