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“Peptides”  

  In organic chemistry, Peptides are an infraclass of organic compounds in the amino acids, peptides, and analogues subclass, in the carboxylic acid class in the organic acids superclass, containing an amide derived from two or more amino carboxylic acid molecules (the same or different) by formation of a covalent bond from the carbonyl carbon of one to the nitrogen atom of another.
  In protein science, Peptides are a class of carboxamide compounds composed of amino acids joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures.

Oligopeptides are composed of approximately 2-12 amino acids, polypeptides are composed of approximately 13 or more amino acids.

In protein science, peptides are long chained linear polypeptides smaller then the linear proteins.
  Examples of some peptides and polypeptides include:

oligopeptides polypeptides glycopeptides lipopeptides cyclic peptides

amyloid-beta peptides cystine-knot miniproteins fibrinopeptide A & fibrinopeptide B polylysine

peptide antibiotics antimicrobial cationic peptides Disintegrins neuropeptides

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