Trypsin is a digestive enzyme responsible for breaking down proteins into smaller peptides in the small intestine. It is secreted by the pancreas in an inactive form known as trypsinogen, which is activated in the intestine. Trypsin catalyzes the hydrolysis of peptide bonds, facilitating the digestion of food proteins for absorption. This enzymatic action is essential for nutrient absorption, enabling the body to utilize amino acids for various cellular functions and overall health.