The bond that holds amino acids together is called a peptide bond.

Here's a breakdown:

* Amino acids are the building blocks of proteins. They have a central carbon atom bonded to an amino group (NH2), a carboxyl group (COOH), a hydrogen atom, and a side chain (R group) that varies depending on the specific amino acid.

* Peptide bond formation occurs through a dehydration reaction, where the carboxyl group of one amino acid reacts with the amino group of another amino acid. This reaction releases a water molecule (H2O).

* The resulting bond between the carbon atom of the carboxyl group and the nitrogen atom of the amino group is the peptide bond.

This process repeats, forming a chain of amino acids called a polypeptide. Multiple polypeptides can then fold together to form a complete protein with a specific structure and function.