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An idea (Greek: ) is an image existing or formed in the mind. The human capacity to contemplate ideas is associated with the capacity for reason, self-reflection, and the ability to acquire and apply intellect. Ideas give rise to concepts, which are the basis for any kind of knowledge whether science or philosophy. However, in a popular sense, an idea can arise even when there is no serious reflection, for example, when we talk about the idea of a person or a place.