A peptide is a short chain of amino acids linked together by peptide bonds. Amino acids are the building blocks of proteins, and peptides can vary in length, typically consisting of 2 to 50 amino acids. They play essential roles in biological processes, including hormone regulation and immune responses. Peptides are important in various fields, including medicine and biotechnology. For example, some peptides act as hormones, such as insulin, which regulates blood sugar levels. Additionally, researchers are exploring peptides for their potential in drug development and as therapeutic agents for conditions like cancer and diabetes.