Brown noise, also called Brownian or red noise, is a type of noise whose energy becomes stronger toward lower frequencies. Its name refers to Brownian motion rather than the color brown. The exact creator and recording method of this five-second clip are not identified. Similar low-frequency noise recordings have circulated widely through audio tools, video platforms, focus playlists, and sound-effect collections. Creators continue using them because the steady bass texture can mask other sounds, reinforce dramatic visuals, and loop without introducing a noticeable melody or spoken phrase.