Theater has evolved significantly throughout history. Ancient Greek theaters featured amphitheaters built into hillsides with semicircular seating for audiences and a central orchestra area for actors and choruses. Notable playwrights included Sophocles, Aristophanes, and Euripides who wrote tragedies and comedies. Pagan theater was communal while Christian theater focused on individual actors on an indoor stage. Shakespeare revolutionized English theater in the 16th century. Modern innovators like Brecht challenged conventions by directly involving audiences in political dramas through techniques like slogans and unconventional staging.