HTML (Hypertext Markup Language) is used to define the structure and layout of web pages using a variety of tags and attributes. Some key points covered are: - HTML documents use tags like <html> enclosed in angle brackets to describe headings, paragraphs, links, images, and other content. - Tags normally come in pairs with opening and closing tags. - HTML can be used to format text, add images and tables, create lists and forms, structure pages using divs and frames, and more. - CSS (Cascading Style Sheets) is often used to define styles and layouts, separate from HTML content. - Forms allow users to enter data through