Basic objective of this article is to Define and Discuss on Infrared Spectra. Molecules of three or higher atoms have continuously transforming bond angles. The opening and closing from the bond angles are known as bending modes. Some popular bending modes are scissoring, rocking, turning, and wagging. Scissoring as well as rocking are in‐plane folding while twisting and wagging usually are out‐of‐plane bending.