HTML (Hypertext Markup Language) is the standard language for creating web pages and web applications. It is used to structure and display websites and applications on the internet.

HTML consists of a set of tags and attributes that define the structure and content of a web page. For example, the "<h1>" tag is used to create a header, while the "<p>" tag is used to create a paragraph. These tags are placed around the content to indicate how it should be displayed on the page.

In addition to text, HTML can also be used to display images, videos, and other multimedia content, as well as create links to other pages and websites. HTML can also be used to create forms, which can be used to collect information from users.

One of the key benefits of HTML is that it is easy to learn and use. With a basic understanding of HTML tags and attributes, you can create simple websites and web pages. More advanced users can use HTML to create complex and dynamic web applications.

Overall, HTML is an essential building block for the web and is used by front-end developers to create user-friendly and visually appealing websites and applications.