A Sound Asset represents a binary audio file with some settings.

To add a new Sound asset, drop an audio file onto the viewport. When loaded, the asset will end up in the Asset Bin in the Default Pack, ready to use.

Sound asset in the asset bin

If you click the Sound Asset, you can edit its settings in the left panel.

Sound panel

The Sound asset can be added to a Sound Component by dragging the asset from the Asset Bin to drop area in the component.

The Sound Panel

Read more about the Sound Component here.