URL reqriting is Simple Rewriting Your URLS (links) Also Redirecting Them To Known URLS.e.g you’ll make the link : view_my_profile.html –> Is Redirected to function.php?op=3
so instead of the link “function.php?op=3″ Which isn’t enough describing itself we’ll make the link “view_my_profile.html” Which is very describtive.Why using mod_reqrite?. Now see if your site has more than 10,000 Links (Dynamic Website) , do you think we would make 10,000 html files ??

=>Of course Not , and here’s the Use Of Mod-Rewrite. We can achive dynamic pages from code and rewrite their URL using this module.

=>well simply This is Very very useful for search Engines to correctly index Your website and gather keywords, we’ll talk about this in details in “Search Engine Optimization Tips”