An opinion is something someone thinks, and is something that cannot be proven. You can disagree or agree with someone's opinion.
For example, the statement " Autumn is the best season" is an opinion. You may disagree and think that "Spring is the best season" not Autumn. Your mom may disagree with both of us, saying that "winter is the best season". None of these statements about the best season can be proven, and anyone can disagree with them. Therefore, it's an opinion.
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