Question

what are public interest pressure group. describe their functioning

Answer 1

A public interest group is a group that promotes the interest of the people of the society. these interest can be of a particular section of the society or of the entire society in general. A public interest groups is a group that represents the common ideas of the society. they work for the general interest of the society.
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Answer 2

Public interest pressure groups stand to represent the general cause of the society. Such pressure groups are different from sectional pressure groups they represent any section of society.
For example - there are groups that are fighting for bonded Labour or child labour.
Sometimes the members of a public interest group may undertake activity that benefits them as well as others.
For example, BAMCFF which benefits the member of the association itself.