White noise is the sound of every audible frequency playing at the same amplitude or volume. It is actually a calming sound, kind of like gentle static. Adding the benefits of a 528Hz tone barely audible above the wall of frequencies takes it to another level of relaxation and creativity without distraction.
White noise can help to reduce anxiety. Because the hum of white noise is a pleasing sound for many people, it can help you enter a more relaxed state. By blocking out other sounds, white noise can make it easier to turn down the rest of the world and focus. This helps with sleep and reduces stress.