In this podcast from his series looking at some of what's new and notable in iOS 15, Thomas Domville Shows us Background Sounds.

Apple says that “everyday sounds can be distracting, discomforting, or overwhelming,” so in support of neurodiversity it is introducing new background sounds in iOS 15.

According to Apple this is how background sounds will help minimize distractions and help users focus, stay calm, or rest:

Balanced, bright, or dark noise, as well as ocean, rain, or stream sounds continuously play in the background to mask unwanted environmental or external noise, and the sounds mix into or duck under other audio and system sounds.