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Allegory of the Cave
The Allegory of the Cave is Plato's famous image in Book VII of the Republic, depicting prisoners chained in a cave who mistake shadows for reality, illustrating the ascent of the soul from ignorance to knowledge of the Forms.
Form of the Good
In Plato's hierarchy, the Form of the Good is the supreme Form described in Book VI of the Republic as what gives truth to objects of knowledge and the power of knowing to the knower, analogous to the sun that illuminates the visible world.
Naturalistic fallacy
The naturalistic fallacy is G.E. Moore's term for the error of defining the property of goodness in terms of any natural property such as pleasure, evolutionary fitness, or social approval. Moore argued that for any proposed natural equivalent of "good" one can always meaningfully ask whether that property really is good, suggesting that moral goodness is a simple, unanalysable quality irreducible to empirical description.
Theory of Forms
Plato's Theory of Forms holds that ultimate reality consists of eternal, unchanging, non-material entities called Forms, which serve as perfect paradigms of which sensible objects are imperfect copies.