So I've listed six different categories, six different types of enzymes. So category one and two we're going to focus on in much more detail in the next several lectures. And three to six, we're going to focus briefly only in this lecture. So let's begin with one digestive enzyme. So whenever we ingest different types of food particles, we ingest these macromolecules. So proteins, carbohydrates, lipids, and it's the function of these digestive enzymes to basically break down these large macromolecules into smaller food particles that can be ingested by the individual cells.