Pressure groups are organizations that influence government policies by putting pressure on the ruling government. Unlike political parties, pressure groups do not aim directly to control or share political powers.
Pressure groups are of two types; Sectional interest groups and Public interest groups. The sectional interest groups seek to promote the interests of a particular section or group of society.
Their main concern is the betterment and well-being of their members and not the people in general. Public Interest Groups are organizations that represent common interests for the betterment of people in general or even a common cause that needs to be defended. A public interest group or a promotional group can also work in self-interest along with others.
Movement groups can be broadly classified under two types. An issue specific movement which seeks to achieve a single purpose usually within a specified time like the Narmada Bachao Andolan.
The other type of movement is more generic that seek to achieve a broad ranging goal in the long term like the women’s movement. Sometimes there is an alliance between all these broad movements which can have an umbrella organization like the National Alliance for Peoples movement.