This document discusses English for Specific Purposes (ESP). It defines ESP as using English in a specific context based on learners' needs, such as business, medical, or tourism contexts. ESP is distinguished from general English by focusing on learners' target needs through needs analysis. The document outlines the absolute characteristics of ESP as meeting learners' specific needs and using the methodology of their field. It also discusses the history and development of ESP in relation to expanding needs for English after WWII and developments in linguistics and education psychology. The document covers approaches to needs analysis, course design, materials development, testing, and the roles and training of ESP practitioners.