Human: What is the difference between a HTML and PHP code? Assistant: 
The difference between HTML and PHP code is that HTML is a markup language that is used to structure and present content on the web, while PHP is a scripting language that is used for server-side development. HTML is static and does not change, while PHP code is dynamic and can be altered to create more interactive websites. HTML focuses on the display of a website, while PHP is mainly used to obtain and manipulate data.