The Juris Doctor degree is the first, professional law degree offered by law schools in the United States. Successful completion of the JD degree allows a graduate to sit for a state's bar exam, leading to a license to practice law. The JD law program is graduate level studies; an undergraduate (bachelor's) degree, most often completed in four years, is required for entry into a JD program. No specific undergraduate major or subject area concentration is required. The JD degree is typically awarded by a U.S. law school after successful completion of three years of study (a part-time option, extending study over a four-year period, is available at some law schools).