Abstract
The essence of Parliament as an institution of social and political representation of interests is analyzed. The stages of development of the institution of parliamentary practice in the context of the transformation of popular representation and its theoretical basis are proposed. The main functions of Parliament as an institution representing the interests in modern society are highlighted. One of the main institutional formation and development of democracy and civil society is to ensure broad representation across the spectrum of social interests, existing in a society that lays the foundation of a stable political system and provides legitimate participation in public life and public affairs people. The key institution in the provision of such acts Parliament as the supreme representative body of the government, expressing the opinion of the nation. Since its inception, the parliament in one form or another has always been a form of institutional reflection of social interests, although the degree of change in the representation of various historical periods and influenced by political events. Thus, the formation and development of parliaments as representative bodies is a natural consequence of the political development of the countries of Western Europe. In fact, today the Parliament in the political systems of the developed countries, as a mediator between society and the government, serves as a buffer area and the articulation of diverse social interests at the state level.