Educational technology refers to the application of scientific knowledge and methods to improve the effectiveness and efficiency of teaching and learning. The document discusses the meaning, objectives, characteristics, and scope of educational technology. Specifically, it defines educational technology as a system involving machines, materials, media, men and methods working together to achieve educational objectives. The objectives of educational technology include improving instruction, reaching more students, and offering independent learning opportunities. The scope of educational technology encompasses all areas of education from curriculum development to teacher training to the use of educational tools and resources.