This document discusses English for Specific Purposes (ESP) and its historical development. ESP involves teaching English in professional contexts like business, medicine, or aviation. It began focusing on grammar in the 1960s-70s, then integrated rhetorical functions in the 1980s. The 1980s also saw a notional-functional approach emphasizing communicative purposes. Later, ESP considered learner strategies and needs. Recently, some propose the term "Academic and Professional Languages." Effective ESP classrooms combine English teaching with the subject matter, set clear goals, and require teachers to adapt their skills to both language and content teaching.