This research paper is going to focus on public opinion and why it should be matter in a country when we speak about public opinion the first thing which comes to our mind is thoughts and point of views of public as a whole on a particular topic when there is no public in a country it cannot be called a country and for the decisions that a country take the opinion of public is way too much necessary. This research paper will examine that how the public opinion varies differently from country to country and how its criteria change from place to place people to people. The research paper is totally a work of doctrinal method which drawn up various major points about public opinion this paper is going to cover the major points of characterization like meaning of the public opinion, process of public opinion that how the people tend to speak, why it matters in a country, fundamental concepts like types of public opinion its characteristics its examples and the evolution and history the paper also going to cover the importance of public opinion and mainly article 19 freedom of speech and expression s highlight which is related to this.