Amino ACID is a type of organic compound that is made up of a basic amino group, an acidic carboxyl group, and a side chain. It is an important building block of proteins and plays a major role in many biological processes. Amino acids are classified as either essential or non-essential, depending on the body's ability to synthesize them. Essential amino acids must be obtained from dietary sources, while non-essential amino acids can be synthesized by the body.