This document provides an overview of English for Specific Purposes (ESP). It discusses the background and features of ESP, including how it is designed for specific disciplines/professions and adult learners. It also covers different classifications of ESP and research approaches in ESP, including needs analysis, genre analysis, and models for analyzing academic texts. The document notes that while genre analysis research has informed ESP materials development, general needs analysis continues to be important. It concludes by emphasizing the importance of cross-cultural issues and the role of ESP teachers in supporting students' mastery of academic genres.