This field refers to careers of service that help to improve the quality of life and well-being of individuals, families, groups, and communities. Careers in this field include activities to educate, train, mentor, counsel and support people of various ages. Careers vary widely, depending on the subject of specialisation and the age of the target individuals or groups. For example, there is a vast difference in teaching style between an educator in primary school and a lecturer at university, or between an adult educator and a health instructor demonstrating to an aerobics class. Special interest fields exist for people who wish to specialise, for instance, a person in general education may wish to specialise in remedial education.