What is the definition of opera?

Opera is a form of theater that combines music, drama, and stagecraft. It is typically performed in a theater with an orchestra, singers, and dancers. Operas are typically sung in a classical style, with the singers using their voices to create a dramatic and emotional effect. The stories of operas are often based on history, mythology, or literature, and they can be either tragic or comedic. Operas can also be used to explore social or political issues.