And simple epithelium is usually found in that region of our digestive system that requires secretion and or absorption. On the other hand, stratified epithelium simply means we have many layers of our epithelial cells stacked on top of one another and this type of epithelium is usually found in those regions that is exposed to a continual amount of mechanical and chemical stress. And we'll see what that means in the next several lectures. So a third type of epithelium is known as pseudostratified epithelium. And this basically means that our layer of cells looks like it's multilayer, but it actually consists of a single layer of cells. So basically, this is an example of pseudostratified epithelium.