HTML and PHP refer to the programming languages I use to create website.

HTML websites

Html websites are less extensive to create. They are "hard coded", meaning the code for the page must be changed in order to modify the content on the page. Web professionals or someone with HTML knowledge must be hired to  make the change. 

PHP websites

Php websites can incorporate database connectivity or forms, adding extra functionality to a website. Although PHP works together with HTML, it is its own programming language, is offers more for a website when combined with a database.