Semantic markup in HTML5 involves using HTML tags for their intended purpose to provide meaning to the content. The use of semantic HTML not only helps browsers and search engines understand the content and context of the content on the web page, but also helps in improving accessibility. Here’s an example of how to use some of the several semantic tags available in HTML5:

```

Welcome to my HTML5 page

This is an introduction text for my page

About

This section contains more detailed information about me

```

In the above example:

- `

` tag used for the header of the document or a section.
- `

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