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From the latin opinĭo, an opinion is a judgment is made on something questionable. The opinion is also the opinion that is relative to something or someone. For example: 'I have a good opinion of that player that I consider excellent', 'Hélène has an unfavourable opinion of my friends', 'Emmanuel gave me his opinion on the problem and I find that he is right.
Means public opinion general estimate and all of the ideas of a social group (the population, for example) about a particular topic. Public opinion is abstract, because it can be collected by surveys or similar work. Means of communication are those contributing advantage to issue public opinion to the extent where their treatment to the news focuses precisely on the thinking of society: 'the president has ignored public opinion', 'public opinion demands answers concerning problems of insecurity. "
To philosophy, the opinion is a proposal where there is full confidence on the truth of knowledge. Otherwise said, opinion admits the possibility of be errors because there is no full evidence. In this sense, would be an assertion with any evidence of the truth from a certainty.
Opinion, whatever it is, is always associated with subjective judgments. The sentence "this car has four wheels" is not an opinion since it verifiable. Just look at the vehicle in question and that this is true. On the other hand, a sentence of the kind "this car is the best that can be found on the market at the moment" is an opinion insofar as it depends on the subjectivity of the person issuing it.