HTML (HyperText Markup Language) is the standard language for creating web pages, providing the structural foundation for all websites. HTML uses tags to define elements like headings, paragraphs, lists, links, images, and forms. Browsers interpret HTML to display web content. While HTML provides structure, CSS (Cascading Style Sheets) controls appearance, and JavaScript adds interactivity. HTML has evolved through versions, with HTML5 being the current standard, supporting multimedia, canvas graphics, and semantic elements that improve accessibility. Government websites rely on properly structured HTML to ensure accessibility for users with disabilities—screen readers and other assistive technologies depend on correct HTML to convey content effectively. Web developers working on government digital services must understand HTML fundamentals, and accessibility audits examine HTML structure. The language's relative simplicity has made the web accessible to diverse creators while supporting increasingly sophisticated applications.