This document defines and describes different types of pressure groups and how they operate. It discusses sectional/interest groups that promote the interests of their members, and promotional/issue groups that promote a particular cause. Pressure groups aim to influence policy through lobbying, publicity campaigns, and demonstrations. Their success depends on factors like resources, organization, public support, and access to politicians. The document also distinguishes between insider groups that are regularly consulted by government, and outsider groups that must use other methods to influence policy from outside formal decision-making processes.