Adjunct professors are part-time instructors at colleges and universities who teach specific courses but are not full-time faculty members. They often hold advanced degrees in their field and may work at multiple institutions simultaneously. Their primary role is to provide specialized knowledge and skills to students, often in subjects like business, arts, or sciences. Unlike full-time professors, adjuncts typically do not have the same responsibilities, such as conducting research or serving on committees. They are usually hired on a contract basis, which means their employment can vary from semester to semester, depending on the institution's needs and course offerings.