A peptide bond, formed via a covalent linkage between two amino acids, results from the reaction between the carboxyl group (\(-COOH\)) of one amino acid and the amino group (\(-NH_2\)) of another. This process generates a \(-CONH-\) bond and liberates a molecule of water (\(H_2O\)). \[ \text{Amino acid 1} - \text{COOH} + \text{Amino acid 2} - \text{NH}_2 \rightarrow \text{Peptide bond} + H_2O \]