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Peptides are compounds that are formed by linking one or more amino acids with a covalent bond. These compounds are classified as polymers, because they typically link together in long chains. All animals on Earth have them in their body, and in a way, they are one of the building blocks of life.
Structurally, proteins and peptides are very similar, being made up of chains of amino acids that are held together by peptide bonds (also called amide bonds). So, what distinguishes a peptide from a protein? The basic distinguishing factors are size and structure. Peptides are smaller than proteins. Traditionally, peptides are defined as molecules that consist of between 2 and 50 amino acids, whereas proteins are made up of 50 or more amino acids.