Final answer:
Bandwagon is a propaganda technique that asserts the popularity of an idea as a basis for its validity and desirability.
Explanation:
Bandwagon is a propaganda technique that promotes the idea that a belief or course of action is popular, hence implying it is good, correct, or desirable. This fallacy, also known as 'appeal to majority' or 'appeal to popularity,' suggests that something is true or worth doing simply because many others believe or do it. It is essential to recognize that the popularity of an idea does not inherently validate its correctness or merit.
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