tell me the uses of PHP language

Question

PHP after html, CSS and JavaScript

Answer 1

the user can not see what it's doing it just runs in the back ground. hints backend while the user can see the changes html and css do so they are front end

Answer 2

php is a back end language. you can think about it like this. html is used to creat a form. css is used to style the form. while php is used to send the form data to - lets say - an email address after it has been submited.