A professor is a teacher at a college or university who specializes in a particular subject. They help students learn by sharing their knowledge and guiding discussions. Professors often conduct research in their field, contributing new ideas and discoveries. They may also publish books or articles, which can help others understand complex topics better. In addition to teaching, professors often mentor students, helping them with their studies and career choices. They may also serve on committees that shape the direction of their department or institution. Overall, a professor plays a vital role in education and the advancement of knowledge in society.