What is the Meaning & Definition of Definition Opinion

The opinion is the subjective evaluation on a particular subject. And personal opinion is, logically, the assessment of an individual.
The reader may think that all opinions are personal. Not exactly, since we have opinions that are not ours (do not belong to our person) but I have copied them from others. It is not easy to have an own personal opinion, i.e., that we ourselves appreciate something without imitate or reproduce the ideas of others.
Opinion differs from knowledge. It was the ancient Greeks who differed doxa (opinion) of the episteme (knowledge). The view is internal, subjective, variable, most of the time interested and does not have a basis. On the other hand knowledge is objective, general, specific character and has some kind of proof that support it.
If someone says I like cakes, it's a particular idea, a simple view and can have other completely contrary. Why it is said that all opinions are respectable. If someone says the sweet pastry they have sugar, he is not issuing an opinion, it is information.
In the journalistic field attempts to distinguish clearly what is opinion and what is information. An example of the first case would be the newspaper column, where the writer expresses its assessment on a topic of current. An example of the information is the news, which must be rigorous and answer a series of questions: what has happened, when, and where. Information views, at least in a direct or explicit manner, not should be incorporated since it is inevitable that indirectly or inlined journalist moved his personal opinion.
Throughout a day, we hear all kinds of opinions. In principle, all are respectable, although there are some that have a base and a rigour and other opinions are more whimsical. If someone says that such famous falls ill and does not provide any data or information to argue it, he is expressing his personal opinion, but it would have more value and more sense if accompany it motives you up to that famous drop it badly.
In the media refers to opinion formers, prestige people having a criteria defined on an aspect of reality. Their opinions are heard by the citizens and are taken into account, to consider them valid, original or attractive.