Blocks out other distracting sounds. Helps kids, animals and some people relax. Helps some people sleep.

It can help babies sleep. Supposedly it simulates the noise in the womb

Heck it helps me sleep -- I'm a light sleeper. I started using the Noisli app every night this past year and my sleep quality improved in noticeable ways.

I also live in a city, so white noise (actually brown noise) masks out tiny noises that interrupt sleep.

It helps kids sleep.