HTML is the abbreviation of HyperText Markup Language, often translated into Chinese as “hypertext markup language.” It is a markup language used to describe the structure of web pages, and it is also the starting point for browsers to understand a page.
It is important to distinguish that HTML is not a programming language. It does not perform calculations or handle logic; it is only responsible for indicating what content exists on a page and what each piece of content is. What the page looks like and how it is arranged on different devices are handled by other technologies.
What it does
When you open a web page, the headings, paragraphs, lists, images, links, and buttons you see all have corresponding tags in HTML. These tags tell the browser: this section is a heading, that section is body text, here is an image, and there is a link.
Organizing tags hierarchically forms the document structure. Which content on a page belongs to the same section, and which parts contain which sub-content, are all determined by this structure. Whether the structure is clear affects both how the browser renders it and whether search engines and assistive reading tools can understand the page.
Common tag types
- Document framework category: the identifier that declares the document type, the root tag that wraps the entire document, the header area that stores page metadata, and the main area that carries visible content.
- Structure division category: page header, navigation, main content, independent content sections, sidebars related to but independent from the main content, and footer.
- Content category: headings, paragraphs, lists, tables, hyperlinks, and images.
- Interaction category: forms and their input fields, and buttons.
- Container category: block-level containers used for layout and inline containers used for local style handling.
In recent years, greater emphasis has been placed on using semantic tags to express the meaning of content. For the same block, using a tag that indicates “this is an independent piece of content” is more meaningful to search engines and assistive tools than using a generic container tag.
Relationship with two other technologies
A complete web page usually consists of three parts: HTML describes the structure, style rules determine the appearance, and scripts handle interactive behavior. Each of the three handles one part, which is also the basic division of labor in modern web pages.
Practical significance for enterprises
Understanding the role of HTML does not require knowing how to write code, but it helps in judging several common things: whether the page structure is clear, whether the heading hierarchy is reasonable, whether images have explanatory text, and whether the body text uses text rather than images. These are directly related to whether a website can be correctly understood and whether it can be retrieved.