Ambience

Hello all minecraftians its kotor1212 here and i would like to explain ambience to you!
i have been around on the internet lately and a lot of people ask about strange noises underground and if it was "herobrine"
well guess what minecraftians it isn't herobrine its ambience they are noises in caves/underground that notch had put in without ambience caves and underground would not be as noisy or keep you up at night thinking about "herobrine"
thanks
kotor1212