As we know there are several terms in the Acoustic field. Some of the terms maybe we generally often heard about it but yet we don't know the meaning of it. Here we attempt to give you some terms and definitions of acoustic terms 101. (1) Diffusion is how sound is scattered and what you see makes a room sound good. Example If you have a noisy restaurant and you want the voices of the customers not to dominate the room, that's a diffusion challenge.  (2) Isolation is about keeping the wrong sounds out of the room. Example: a crowded canteen next to the meeting room. This is where sound ratings come in. They determine the absorption of sound material. So a partition with a higher rating will be better at absorbing sound than a partition with a lower rating -- Determined in highly scientific laboratory tests, we can focus on two important elements that are always considered: frequency, which is measured in hertz (Hz), and decibels (dB). (A) The frequency can be called the pitch of the sound and is determined by how often the sound waves follow each other. You can visualize it as ocean waves rolling over each other in succession. (B) Decibels are how loud the sound is.This deserves a whole post on its own, but to keep it simple: more decibels equals more volume. In our wave analogy, decibels are determined by how big or tall the wave is. So the bass music at an event will be high waves hitting the beach relatively slowly, while whistles are waves hitting the beach in succession. Diffusion is when you scatter a wave and absorption is when you reduce its size or frequency.