"Maxillofacial" is a complicated word, but it simply means the area of the face and jaw. It all makes sense once you know that "maxilla" is Latin for jaw. Therefore, an oral and maxillofacial surgeon is a doctor that does surgery on the soft tissues of the face, the jaw, the teeth, and other areas of the mouth.
An oral and maxillofacial surgeon does a variety of procedures, from routine wisdom teeth extractions to removing tumors in the mouth to adjusting or reconstructing patients' jaws after an accident or birth defect. They have to be ready to act in emergencies and to instruct patients in aftercare procedures.
The road to becoming an oral and maxillofacial surgeon is long and involves a lot of hard work. Oral and maxillofacial surgeons first get bachelor's degrees, then they finish dental school, do several years of residency, and get licensed by the state before they finally earn the title of surgeon.