An ideology is a set of ideas that constitutes one’s goals, expectations, and actions. An ideology can be thought of as a comprehensive vision, as a way of looking at things, as in common sense and several philosophical tendencies, or a set of ideas proposed by the dominant class of a society to all members of this society.
The main purpose behind an ideology is to offer either change in society, or adherence to a set of ideals where conformity already exists, through a normative thought process. Ideologies are systems of abstract thought applied to public matters and thus make this concept central to politics. Implicitly every political tendency entails an ideology whether or not it is propounded as an explicit system of thought. It is how society sees things.