Professors are usually employed in colleges and universities, and their titles are lower than those of associate professors. Professors are the highest level of university teachers' titles. They are usually responsible for offering courses in their own fields and guiding students' professional training, which is widely recognized by academic circles. Professors are mainly responsible for teaching and training. In addition to teaching, professors usually involve in-depth research in their own professional fields, publishing papers, participating in business cooperation and guiding students. Professors mainly teach students on specific subjects, while professors have a wider range of work, including teaching, scientific research and publishing high-quality papers. In addition, a professorship is sometimes an honorary title established by an external foundation to commend professors who have made outstanding achievements in a specific field, while in some countries, such as the United States and Germany, a professorship may be a higher academic title than a full professor.