This document discusses educational technology and its evolution and theories. It defines educational technology as the development, application, and evaluation of systems, techniques, and aids to improve the human learning process. It outlines four revolutions in education including the adoption of written word and printing press. Theories define it as applying science and technology to education. Characteristics include improving teaching and learning through scientific advancements. Objectives are to identify needs, develop suitable curriculum, and manage the educational system. Forms include teaching, instructional, behavioral, and instructional design technologies.