Digestion is a process of breaking down food into substances that the body can use for energy, storage, growth, and repair.
Protein digestion is the process of digesting the proteins by using enzymes such as protease, dipeptidase, exopeptidase, pepsin, trypsin, and chymotrypsin.
These enzymes and stomach acid cleave the peptide bond between the large polypeptide chains and make small polypeptide chains.
Proteins are made up of amino acids hence the last process is the hydrolysis of peptide bonds to free amino acids.
So, amino acids are the end product of protein digestion.