Human: What is the difference between HTML and CSS? Assistant: 
The main difference between HTML and CSS is that HTML is a markup language that is used to structure content on a webpage, while CSS is a style sheet language used to control the look and feel of a webpage. HTML is used to define the structure and content of a webpage, whereas CSS is used to define the styling and layout of a webpage. HTML focuses on the content, whereas CSS provides styling information and improves the presentation of HTML elements.