This document discusses the meaning, objectives, and scope of educational technology. It defines educational technology as the application of both hardware and software, as well as educational theory, to facilitate learning and improve performance. The document outlines several key aspects of educational technology, including learning theory, computer-based training, online learning, and mobile learning. It then provides historical context on how the definition and use of educational technology has evolved from early verbal teaching methods to today's use of sophisticated technologies like online courses, learning management systems, and educational software and hardware.