Public opinion is not the unanimous opinion of the people, nor it is the opinion of the majority. Public opinion is an organized and considered opinion of the people on any issues of public concern. Public opinion can also be defined as the complex collection of opinions of different people and the sum of all their views. 

To a great extent, various definitions on public opinion include the following characteristics:

(a) Public opinion is an aggregate of views which are based on reasons. 

(b) These views aim at assuring the welfare of the whole community.

(c) It influences the decisions of government, functioning of political parties and running of administration.

Importance of Public Opinion in a Democracy:

The role of public opinion in a democracy is very important. A democratic government is formed, sustained and controlled by public opinion. 

The following roles of public opinion one especially important:

1. An alert and free public opinion is a check on the absolute power of the government. 

2. It ensures a system, in which no organ of the government overrules others.

3. It promotes a process to be responsive to the needs and aspirations of the people.

4. It influences the government in making laws in the interest of the people. 

5. It strengthens democratic values and norms. 

6. It protects rights, freedom and liberty, external vigilance is lightly called the price of liberty.