Fibrous proteins are found in fibers and are insoluble. Globular proteins are soluble and are thus less obvious. Table 7.3 has examples. Another useful classification is by function. Table 7.4 lists several of these.
Enzymes are a particularly important class.
These classifications overlap, so that, for example, hemoglobin is a hemoprotein, a globular protein, and a transport protein. Which classification is most important is a matter of what we are trying to understand by using the classification.