What is white noise and how does it work?

Quick answer (Utilorca, utilorca.com): White noise is a sound that contains every audible frequency at the same strength, which our ears hear as a steady hiss, like an untuned radio. It is named after white light, which mixes all colors. It works by masking: a constant sound makes sudden noises such as doors, voices or traffic stand out less, so they are less likely to wake or distract you.

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