Sectional interest groups represent a section of society such as workers, employees, business persons, industrialists, followers of a religion, caste group, etc. On the other hand, public interest groups promote collective rather than selective good. They aim to help groups other than their own members. For example, a group fighting against bonded labour fights not for itselfs but for those who are suffering under such bondage. The principal concern of sectional interest groups is the betterment and well-being of their members, not society in general.