| Full form | Hypertext Markup Language | eXtensible Markup Language |
| Purpose | Designed for structuring and presenting content on the web | Designed as a general-purpose markup language for representing structured data |
| Tags | Contains predefined tags that define the structure and presentation of web content | Does not have predefined tags and allows for the creation of custom tags |
| Document Type | HTML documents have a specific predefined structure | XML documents have a flexible structure defined by the user or a document type definition (DTD) |
| Data Validation | Does not typically perform strict data validation | Can perform strict data validation using DTD or XML Schema |
| Extensibility | Limited extensibility, primarily designed for web content | Highly extensible and customizable, suitable for various data representation needs |
| Presentation Focus | Focuses on the visual presentation and layout of content | Focuses on the structure and organization of data |
| Data Interchange | Not primarily intended for data interchange, but can be used for simple data exchange | Well-suited for data interchange between different systems and platforms |
| Semantics | HTML tags have predefined meanings and semantic roles | XML does not inherently define semantic meanings for tags |
| Browser Rendering | Rendered by web browsers to display web pages visually | Not rendered directly by web browsers; requires additional processing for visualization |
| Popularity | Widely used for building web pages and web applications | Used for a variety of purposes including data exchange, configuration files, and data representation |
