White noise is a type of sound that includes all frequencies of sound in equal measure, dormiphones creating a constant, steady sound. It can be described as a soft hissing or humming sound, similar to the sound of a fan or a radio tuned to static. White noise works by masking other sounds that might disturb your sleep or concentration, making it easier to relax and focus.White noise is a type of sound that includes all frequencies of sound in equal measure, dormiphones creating a constant, steady sound. It can be described as a soft hissing or humming sound, similar to the sound of a fan or a radio tuned to static. White noise works by masking other sounds that might disturb your sleep or concentration, making it easier to relax and focus.