Generally speaking, "digital" refers to digital products containing "digital technology", such as digital cameras, digital video cameras, digital learning machines, digital walkman, etc. With the development of science and technology and the emergence and development of computers, a number of products with numbers as recording marks have appeared, replacing traditional movies, videos, tapes and so on. We collectively refer to this kind of products as digital products. Such as TV/computer/communication equipment/mobile or portable electronic tools, etc. Have been digitized to a considerable extent.