HTML (Hypertext Markup Language) is the standard language used to create web pages. It is a markup language, which means that it uses tags to describe the structure and content of a web page. HTML tags define the headings, paragraphs, lists, links, images, and other elements of a web page.
CSS (Cascading Style Sheets) is a stylesheet language used for describing the look and formatting of a web page. CSS is used to control the layout, colors, fonts, and other visual aspects of a web page, separate from the HTML content. CSS makes it easy to maintain a consistent look and feel across multiple pages of a website.