Carbohydrates are a class of naturally occurring compounds, probably the most abundant and widespread organic substances in nature. They are essential constituents of all living things. Carbohydrates are divided into four major groups based on the degree of polymerization: monosaccharides, disaccharides, oligosaccharides, and polysaccharides. Given below is a brief account of the structure and functions of carbohydrate groups. This article explores the structure of carbohydrates and its types, focusing on their major classifications and how their structures inform their roles in living systems. In this article, we will discuss all the various classifications of carbohydrates such as Monosaccharides, Disaccharides, Oligosaccharides, and Polysaccharides.