(1) Mainframe Stage
The 1940s and 1950s were the first generation of electron tube computers. After the development of electron tube digital computers, transistor digital computers, integrated circuit digital computers and large-scale integrated circuit digital computers, computer technology is gradually maturing.
(2) minicomputer stage
The 1960s and 1970s were the first "downsizing" of large mainframe computers, which could satisfy the information processing requirements of small and medium-sized business units at a lower cost and an acceptable price;
(3) microcomputer stage
(4) microcomputer stage
The 1970s were the first generation of electronic tube computers, which could satisfy the information processing requirements of small and medium-sized businesses. p>
The 1970s and 1980s, is the second "downsizing" of the mainframe, the United States in 1976 Apple was founded in 1977 on the launch of the AppleII computer, a great success. 1981 IBM launched the IBM-PC, since then it has gone through a number of generations of evolution, occupation of the personal computer market, making the personal computer market.
(4) Client/Server
That is, C/S stage. With the establishment of the first global on-line booking system by IBM and American Airlines in 1964, which connected more than 2,000 booking terminals in the United States at that time with telephone lines, marking the entry of computers into the client/server stage, a model that is still in heavy use today. In a client/server network, the server is the core of the network, and the client is the foundation of the network, the client relies on the server to obtain the required network resources, and the server provides the client with the necessary resources for the network.The advantage of the C/S structure is that it can give full play to the client's PC's processing power, and a lot of work can be processed on the client before submitting it to the server, which greatly reduces the pressure on the server;
(5) Internet stage
Also known as the Internet, the Internet, the inter-network stage. Internet that is, wide area networks, local area networks and individual machines in accordance with certain communication protocols composed of international computer networks. The Internet began in 1969, under an agreement developed by ARPA (U.S. Department of Defense Research Projects Agency) to bring together universities in the southwestern United States (UCLA (University of California, Los Angeles), Stanford Research Institute (Stanford University Research Institute), UCSB (University of California), and University of Utah). Utah) were connected to four major computers. Since then it has gone through phases of text to images and now voice and video, with faster and more powerful broadband. The Internet is characterized as global, massive, anonymous, interactive, growing, flat, instantaneous, multimedia, addictive, and noisy. The significance of the Internet should not be underestimated. It is a solid step towards the global village;
(6) Cloud Computing Era
Since 2008, the concept of Cloud Computing has become popular, and it is becoming a popular and popular term. Cloud computing is seen as a "revolutionary computing model" because it makes it possible for supercomputing power to flow freely over the Internet. Instead of investing in expensive hardware, businesses and individual users can purchase and lease computing power over the Internet, paying only for the features they need while eliminating the hardware, software, and expertise costs of traditional software. Cloud computing allows users to access applications without the complexity of technology and deployment. Cloud computing encompasses development, architecture, load balancing, and business models and is the future model for the software industry. It is web-based services that are also Internet-centric.