What is a Tag

 

Definition

In computer terms, a tag is a keyword or label that is used to define elements in markup languages like HTML and XML. Tags act as identifiers to structure content, define metadata, or provide instructions for how content should be displayed or processed.

Types of Tags

  • HTML Tags: Used to create elements like paragraphs, headings, links, and images on web pages (e.g., <p>, <a>, <img>).
  • XML Tags: Used for defining custom data structures in a hierarchical format.
  • Metadata Tags: Provide information about a webpage, such as its title, description, or keywords (e.g., <meta> tags).

Purpose and Usage

Tags are essential in web development and data management as they help to structure, organize, and describe content. For instance, in HTML, tags determine how elements are displayed on a webpage, while in XML, tags define data for seamless information sharing across systems.

Examples

  • HTML: <h1>Welcome</h1> creates a heading element.
  • XML: <book><title>Example</title></book> defines a book structure.
  • Metadata: <meta name="description" content="Example Description"> describes the webpage.

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