Political Parties: These are organized groups of people who share similar political views and work together to influence government policy. They act as a major linkage institution by representing citizen's interests to the government.
Interest Groups: Interest groups are organizations where members share common concerns, and they work together to influence governmental policies that impact those concerns. They serve as another type of linkage institution.
Media: This refers to various means of mass communication (like TV news or print newspapers). The media acts as a linkage institution by informing citizens about governmental actions and policies.