HTML <audio> element is used to embed sound content in web pages. It may contain one or more audio sources, represented using the src attribute or the <source> element. The browser will choose the most suitable source based on the type and codec specified.

Here is an example of how to use the <audio> element:

<audio controls>
  <source src="song.mp3" type="audio/mpeg">
  <source src="song.ogg" type="audio/ogg">
  Your browser does not support the audio element.
</audio>

The controls attribute adds audio controls, such as play, pause, and volume. The text between the <audio> and </audio> tags will only be displayed in browsers that do not support the <audio> element.

You can also use the <audio> element to add sound effects to your web page by using the autoplay, loop, and muted attributes.

For more information and examples, you can refer to the MDN documentation on the <audio> element.