In HTML (Hypertext Markup Language), a tag is a code element that defines how content is displayed and structured on a web page. HTML tags are the building blocks of web pages, instructing the web browser how to display text, images, and other types of content. Each tag has a specific purpose, such as

for paragraphs, for hyperlinks,

for images, and

for sections or divisions in the layout. Proper use of HTML tags is crucial for creating well-structured, accessible, and SEO-friendly web pages.