Audio: is sound within the acoustic range available to humans
Sound: is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing
Audio engineering: is a part of audio science dealing with the recording and reproduction of sound through mechanical and electronic equipments.
Sound engineering: is mixing sound into other forms of media using various programmes and equipments.
*Acoustic: Music not electrically enhanced or modified.
