Concept:A pressure group is an organized body that seeks to influence government decisions without seeking to gain political power.
Explanation:Political parties analyze issues, aggregate many different interests, and contest elections in order to form a government.
Pressure groups are different because they focus on articulating the specific interests of their members or a particular section of society.
They do not normally compete for political office; instead, they try to influence those who hold power.
Thus, the main distinguishing function is that pressure groups articulate interests rather than contest elections or form government.
Answer:They articulate interests.