what is aristotle concept of tragedy?

Aristotle defined tragedy as "the imitation of an action that is serious and also, as having magnitude, complete in itself." It incorporates "incidents arousing pity and fear, wherewith to accomplish the catharsis of such emotions."

Tragedy is the “imitation of an action” (mimesis) according to “the law of probability or necessity.” Aristotle indicates that the medium of tragedy is drama, not narrative; tragedy “shows” rather than “tells.” According to Aristotle, tragedy is higher and more philosophical than history because history simply relates what has happened while tragedy dramatizes what may happen, “what is possibile according to the law of probability or necessity.” History thus deals with the particular, and tragedy with the universal. Events that have happened may be due to accident or coincidence; they may be particular to a specific situation and not be part of a clear cause-and-effect chain. Therefore they have little relevance for others. Tragedy, however, is rooted in the fundamental order of the universe; it creates a cause-and-effect chain that clearly reveals what may happen at any time or place because that is the way the world operates. Tragedy therefore arouses not only pity but also fear, because the audience can envision themselves within this cause-and-effect chain (context).