Another way to classify materials is by its usage case; in this scenario materials are classified into structural and functional materials. Structural materials, as the name suggests, serves to protect the structural integrity of something. A car frame, for example, would be a structural material. Functional materials, on the other hand, serves some kind of function (other than supporting weight, that is). The majority of modern-day materials science research lives in this functional materials space, ranging from semiconductors in computer chips, battery electrodes and OLEDs to piezoelectrics and MRI machines.