A Peptide Bond ($-CO-NH-$) is a covalent bond formed through a condensation reaction (elimination of water) between two amino acids:

• The carboxyl group ($-COOH$) of one amino acid reacts with the amino group ($-N{H}_2$) of another.
• This linkage is a type of amide bond.
• Due to resonance, the peptide bond has partial double bond character, making it planar and rigid.