wats e use of it??

wats the use of mysql & php? wat can it do and how does it works??

Based on your questions from the other two threads following the same line. I'm just going to introduce you to a great resource which you can practically find anything you want on and has been an invaluable tool in my knowledge seeking journey.

Google

For pete's sake, you can even ask google what's google and what it can be used for.