The word theater means a “place for seeing.” the two most common types of theatre plays are comedy and tragedy, symbolised by the theatre masks. The first known theatrical event was a performance of the sacred plays of the myth of Osiris and Isis in 2500 BC in Egypt. This story of the god Osiris was performed annually at festivals throughout the civilization, marking the beginning of a long relationship between theatre and religion.The ancient Greeks began formalizing theatre as an art, developing strict definitions of tragedy and comedy as well as other forms, including satyr plays. Like the religious plays of ancient Egypt, Greek plays made use of mythological characters. The Greeks also developed the concepts of dramatic criticism, acting as a career, and theatre architecture.Western theatre continued to develop under the Roman Empire, in medieval England, and continued to thrive, taking on many alternate forms in Spain, Italy, France, and Russia in the 16th, 17th and 18th centuries. The general trend over the centuries was away from the poetic drama of the Greeks and the Renaissance and toward a more realistic style, especially following the Industrial Revolution. A uniquely American theatre developed with the colonization of North America.The history of Eastern theatre is traced back to 1000 BC with the Sanskrit drama of ancient Indian theatre. Chinese theatre also dates back to around the same time. Japanese forms of Kabuki, Noh, and Kyogen date back to the 17th century AD. Other Eastern forms were developed throughout China, Korea, and Southeast Asia.The most popular forms of theater in the medieval Islamic world were puppet theatre (which included hand puppets, shadow plays and marionette productions) and live passion plays known as ta’ziya, where actors re-enact episodes from Muslim history. In particular, Shia Islamic plays revolved around the shaheed (martyrdom) of Ali’s sons Hasan ibn Ali and Husayn ibn Ali. Live secular plays were known as akhraja, recorded in medieval adab literature, though they were less common than puppetry and ta’ziya theater.