Use continuous, consistent sound across all audible frequencies—masking disruptive noises and promoting focus, relaxation, or sleep. White noise contains all frequencies at equal intensity (sounds like static or rainfall). Related sounds: pink noise (lower frequencies emphasized—deeper, softer), brown noise (even more bass—rumbling), nature sounds (rain, ocean, forest).
Benefits: masks intermittent noises (traffic, neighbors, snoring) that disrupt sleep or concentration, creates consistent audio environment, helps tinnitus sufferers, calms babies, aids meditation. Mechanism: sound masking—brain stops noticing constant background sound but notices changes; reduces contrast between silence and sudden noises. Apps, machines, fans, or online videos.
Some find it essential; others prefer silence. Personal preference. Sleep hygiene tool. Focus aid for ADHD. Inexpensive, accessible intervention.