It basically labels that antigen along with the pathogen for destruction by our immune system. And we'll see exactly how that takes place in just a moment. First, let's discuss the structure of our antibody. Now, our antibody is also known as our immunoglobulin, where immuno means our immune system and globulin means our protein. So immunoglobulin is written with the following two letters IG. And we'll see that there are actually five different types of immunoglobulins.