Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. Coursera's HTML catalogue teaches you about the foundational technology used to create web pages. You'll learn everything from the basics of creating a web page, embedding images and links, formatting text, creating tables, to more advanced concepts like form controls and multimedia. By understanding the structure and semantics of HTML, you'll be able to create interactive, dynamic, and accessible web content, whether as a web developer, digital marketer, or someone aspiring to understand the digital world better.