Most people, except programmers, are more familiar with what is called client side technologies like HTML and JavaScript. This makes sense since most people do not even dabble much with these client side technologies much less need not learn about server side technologies. However, do you know that all websites that makes use of a database, payment processors or any thing else that gets input from visitors and processes or saves the data also make use of server side technologies? The difference between the two is simple, client side technologies run and execute on the web browser while server side technologies do this on the server. Examples of server side technologies are Perl, ASP, PHP and JSP.