How is a peptide bond formed?

(a) Amino adds condense to form peptide. In this process, the carboxylic group of one amino add joins with the amino group of another amino add with a loss of water molecule.
(b) The bond thus formed (-CO-NH-) is called amide or peptide bond. A chain of two amino add is called dipeptide, that of three is tripeptide and many is polypeptide.