HTML stands for HyperText Markup Language. It is the standard markup language used for creating web pages and web applications. HTML provides a structure for the content of a web page, including headings, paragraphs, links, images, tables, forms, and more. It uses a set of tags to define the structure and formatting of the content.

Here is an example of a simple HTML document structure:

```html

Hello, World!

This is a paragraph.

Click me ```

In this example, the `` declaration defines the document type as HTML5. The `` element is the root element of an HTML page. The `` section contains metadata about the document, such as the page title. The `` section contains the visible content of the web page.

Inside the ``, we have a heading element `

` with the text "Hello, World!", a paragraph element `

` with the text "This is a paragraph.", and an anchor element `` that creates a hyperlink with the text "Click me" and the URL "https://www.example.com".

This is just a basic example, and HTML offers much more functionality and flexibility for creating interactive and dynamic web pages when combined with CSS (Cascading Style Sheets) and JavaScript.