Fragmentation is a continuous process in any windows based computer. It happens because of continuous writing and deleting of files by various means, be it day to day usage or installing and uninstalling application. On average about 100 files get fragmented daily, even if you do not install any application and use the PC for about 8 hours a days for daily work.
Fragmented files reduces hard disk performance and it also makes some portion of hard disk unusable. So whenever you try to copy new files it increases fragments further, thus increasing fragmentation further exponentially. For better disk performance and overall Windows speed keeping file fragment low is a essential key. By Defragmenting we increase the life of a hard disk as well.

IObit Smart Defrag - Free Utility
It is a myth that if we keep defragmenting our hard disk, it will wear out soon and life of hard disk becomes less. In fact the reverse of this true, by defragmenting we improve seek time and head movement of Disk is reduced which results in more life of Hard disk in longer term. Now to keep your hard disk healthy and long lasting every system admin advices regular defrag of your hard disk, essentially at least once in a month.
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