Ask Your Web Designer About PHP and MySQL...
if they say they don't know PHP and mySQL, you should not hire them.
Everybody who do web designs nowadays should at least know that is PHP and mySQL.
They are two of the most popular softwares used for web applications in the world today!
PHP is basically a script language that has a syntax similar to C. Almost all servers be it Windows or Linux support PHP by default.
mySQL is a swell database program, it is free, easy to use and lightning fast!
These two softwares make things work as it is now on the Internet. They are the prime mover. <