This document discusses the types, characteristics, and development of English for Specific Purposes (ESP). It identifies three main types of ESP: 1) English as a restricted language for occupations like air traffic controllers, 2) English for Academic and Occupational Purposes which includes branches like English for Science and Technology, and 3) English with specific topics focused on future needs like attending conferences. Characteristics of ESP include being needs-based, content-focused, analyzing appropriate syntax and lexis, and not following a predetermined methodology. The development of ESP involved register analysis, rhetorical analysis, target situation analysis, emphasizing skills and strategies, and adopting a learning-centered approach.