• Melodrama is a kind of drama that provides sensational entertainment.
• Comedy is a kind of drama which begins with adversity or discord but ends in happiness.
• Tragedy is a form of drama which presents the fall of a superior human being for a mistake of some kind.
• Tragicomedy is a kind of play in which tragic and comic scenes are mingled.
Source: An ABC of English Literature, Dr. M Mofizar Rahman.