Like white light, that is the combination a of all visible light frequencies, white noise is the sound that is produced when all sound frequencies are played at once. It is a pitch-less drone sound.
White noise as well as brown noise and pink noise has a variety of benefits and applications. It is helpful to cover unwanted noises. Because of its sound masking properties, white noise is ideal both as a concentration aid and a relaxation aid. It can be used to help those who suffer from deficit disorder or tinnitus (a disorder that produce a constant ringing ears sensation).
In an office setting, it may allow you to avoid hearing chatting coworkers and concetrate on your tasks. For infants, white noise is designed to block harsh and unfriendly noises. A sleeping baby can be easily awaken by a sudden sound. White noise avoid it because soothing sounds can prevent one hearing annoying sounds.
The white is not only helpful to humans, but also to other animals, such as dogs, which may have disorders because of separation or fear.