Educational technology: Educational technology is the theory and practice about the design, development, utilization, management and evaluation of learning process and information resources. It takes the learning process and information resources as the research object, and it is "the theory and practice of applying technical means to optimize the education and teaching process to improve the effect, efficiency and benefit of education and teaching". The technology mentioned here includes tangible technology and intangible technology. Tangible technology mainly refers to the material tools used in the teaching process, while intangible technology includes the skills, strategies and methods used to solve educational and teaching problems, as well as the teaching ideas and theories contained therein. Tangible technology is the support of educational technology, while intangible technology is the soul of educational technology.