Pink noise is a type of sound that contains equal energy across octaves, making it sound balanced to the human ear. Unlike white noise, which has a consistent frequency across all ranges, pink noise has more power in lower frequencies. This gives it a deeper, softer sound that many people find soothing. Commonly used for relaxation and sleep, pink noise can help mask other disruptive sounds, creating a more peaceful environment. It is often found in nature, such as the sound of rain or ocean waves, and is used in various applications, including sound therapy and audio engineering.