The history of theatre charts the development of theatre over the past 2,500 years. While performative elements are present in every society, it is customary to acknowledge a distinction between theatre as an art form and entertainment and theatrical or performative elements in other activities. The history of theatre is primarily concerned with the origin and subsequent development of the theatre as an autonomous activity. Since classical Athens in the 6th century BC, vibrant traditions of theatre have flourished in cultures across the world.
Theatre probably arose as a performance of ritual activities that did not require initiation on the part of the spectator. This similarity of early theatre to ritual is negatively attested by Aristotle, who in his Poetics defined theatre in contrast to the performances of sacred mysteries: theatre did not require the spectator to fast, drink the kykeon, or march in a procession; however theatre did resemble the sacred mysteries in the sense that it brought purification and healing to the spectator by means of a vision, the theama. The physical location of such performances was accordingly named theatron.
According to the historians Oscar Brockett and Franklin Hildy, rituals typically include elements that entertain or give pleasure, such as costumes and masks as well as skilled performers. As societies grew more complex, these spectacular elements began to be acted out under non-ritualistic conditions. As this occurred, the first steps towards theatre as an autonomous activity were being taken.
Greek theatre, most developed in Athens, is the root of the Western tradition; theatre is in origin a Greek word. It was part of a broader culture of theatricality and performance in classical Greece that included festivals, religious rituals, politics, law, athletics and gymnastics, music, poetry, weddings, funerals, and symposia. Participation in the city-state's many festivals—and attendance at the City Dionysia as an audience member (or even as a participant in the theatrical productions) in particular—was an important part of citizenship. Civic participation also involved the evaluation of the rhetoric of orators evidenced in performances in the law-court or political assembly, both of which were understood as analogous to the theatre and increasingly came to absorb its dramatic vocabulary. The theatre of ancient Greece consisted of three types of drama: tragedy, comedy, and the satyr play.