White noise — not music, just sound. Static-like noise with a flat or shaped frequency spectrum. White noise covers the full range. Pink noise rolls off the high end. Brown noise sits deeper still, closer to the rumble of rain. Tracks are designed to loop seamlessly for hours, with no melody, no rhythm, and no abrupt level changes.
Parents use it to settle babies and toddlers through long naps. Office workers run it as a background mask against open-plan chatter. Students play it during study sessions and exam prep. People with tinnitus loop it overnight as relief. Also fits meditation, deep-focus coding, and long-haul flights. See also ambient or sleep.