Brownian Noise, also known as Brown Noise, is a type of sound signal that has a deeper, richer quality compared to other noise types like White Noise. It is characterized by a random pattern of sound waves that decrease in intensity at higher frequencies, resulting in a more soothing and less harsh auditory experience. The name comes from the botanist Robert Brown, who discovered the random motion of particles in a fluid, known as Brownian Motion. This concept of randomness is reflected in the sound waves of Brownian Noise, making it popular for relaxation, sleep, and concentration purposes.