Drama was a form of performance that portrayed characters 'personalities, emotions, and conflicts through oral or written language, and presented social life and cultural features. A play usually included the script, actors, director, music, lighting, and stage design. The origin of drama can be traced back to ancient Greece, when early forms of drama such as the Iliad and the Odey had already appeared. During the Middle Ages and the Renaissance, plays were further developed, such as the classic plays of Hamlet and King Lear. In modern times, drama has become a global art form, not only in Europe and Asia, but also in many different cultural and social backgrounds. Drama could not only bring visual and auditory enjoyment to the audience, but it could also trigger the audience to think and discuss social, human and cultural issues.