Amino Acids are organic compounds that act as the basic building blocks of proteins in all living organisms. They play a central role in nearly all biological processes, including growth, repair, and metabolism. Amino acids are classified into essential, non-essential, and conditionally essential types. Essential amino acids must be obtained through diet, while non-essential amino acids can be produced by the body. Conditionally essential amino acids are required in greater amounts during stress, illness, or growth.