Educational technology is the theory and practice about the design, development, application, management and evaluation of learning process and learning resources.

The research content of educational technology is the design, development, application, management and evaluation of learning process and learning resources. The purpose of educational technology is to promote learners' learning. Educational technology is a subject that pays equal attention to theory and practice. Learning process is the object of educational technology research and practice, and learning resources are the necessary conditions for optimizing learning.

My understanding of educational technology can be divided into the following three aspects:

(1) Educational technology is a carefully selected and reasonably organized learning textbook. These learning materials should not only meet the needs of society and students' personal learning, but also conform to the cognitive laws and be suitable for students' learning. This is a software component of educational technology.

(2) Educational technology is a variety of materialized means used in the educational process. From the most basic blackboard, chalk, text teaching materials, teaching AIDS, projectors, slide projectors, televisions, wired and wireless public address systems, video display tables to multimedia computers; CAW closed-circuit television teaching network system and computer bidirectional transmission interactive network system are both hardware components of educational technology.

(3) Educational technology is also a method to design, implement and evaluate the teaching process. Such as Comenius' intuitive teaching method, Herbart's four-stage teaching method and the heuristic teaching method advocated by Confucius, an ancient educator in China. This is also an integral part of educational technology.