The Audio component is for adding audio to a layout.

Key information about this component: 

Layout canvas elements

• Container - This is required to add a margin below the audio player optionally.
• Entity browser - The Audio component uses a media entity. The Embedded view mode is used.

Component form fields

• Audio media - This uses the Entity browser field. It relies on the Media library included with Drupal core. 
• Space below - Adds a margin to the bottom of the video. This is required to separate it from content that might be placed below it.

UIKit audio component