This document provides an overview of the origins and development of English for Specific Purposes (ESP). It discusses how ESP emerged after World War II due to increased demand for English in technical, scientific, and economic fields. It also summarizes the key stages in the development of ESP, from early approaches focusing on register analysis and sentence-level grammar to later approaches incorporating discourse analysis, target situation analysis, skills and strategies, and learner-centered methods. The document also examines differing definitions of ESP provided by scholars over time.