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An idea is the first and most obvious acts of intellection, since it is limited to mere knowledge of something. It is a mental representation of an object or image.
Similarly, the idea is pure and rational knowledge due to the natural conditions of our reason; the plan and the provision which is organized in the fantasy for the formation of a work; and intend to do something (for example, "my idea is to renounce the promotion and demand my resignation»).
As a philosophical term, an idea can be analyzed from several points of view: the logic (an idea is comparable to a concept insofar as it has a meaning), the ontological (the idea as a physical thing that exists in the real world), the transcendental (the idea as a possibility of knowledge) and the psychological (the idea is a subjective mental representation).
In his theory of ideas, Plato put ideas in the intelligible world, which, according to him, is the only source of true knowledge. For Plato, there are two independent worlds although only related one to the other: the imperfect and transient material things and the world perfect and eternal ideas.
The concept of idea is used to form various concepts. For example, a fixed idea is an obsessive idea. Moreover, the universal ideas are all these concepts that are formed by abstraction, and who represent mentally, reduced to a common unit, of the realities that exist in many beings.
Wave idea (something imprecise), have a high idea of (take something or someone in great esteem) and have idea that (think/hold for probable that) are some concepts related to ideas.