English has become a global lingua franca used for international communication. It spread through colonialism, economics, travel, information exchange, and popular culture. Like other languages, English exists in many varieties defined by regions such as British English, American English, and Australian English. When teaching English, teachers must consider which variety to teach and expose students to different varieties at appropriate levels. Effective English language teaching requires understanding methodology, learner differences and styles, levels, motivation, the teacher's role, and learning contexts.