Chemistry is that branch of science that discusses the study of substances and materials. Chemistry plays a crucial role in many areas. It is through chemical means that some products are synthesised and manufactured, and end products are obtained. The knowledge of chemistry can be applied to change the nature of the existing material or to create new products. In this chapter, the student will learn about the importance and applications of chemistry in various fields. All our activities depend upon our knowledge of chemistry. All everyday articles we use such as plastics, clothes, detergents, toothpaste are all derived by knowledge of the composition of compounds. Several industries are dependent on chemistry and its applications.