C/S is also called Client/Server or Client/Server mode. The server usually adopts high-performance PC, workstation or minicomputer, and large database system, such as Oracle, Sybase, Informix or SQL Server. The client needs to install special client software.

　　B/S is the abbreviation of Browser/Server. Only one browser, such as Netscape Navigator or Internet Explorer, is installed on the client, and Oracle, Sybase, Informix or SQL Server databases are installed on the server. The browser interacts with the database through the Web Server.

　　The advantage of C/S is that it can give full play to the processing power of the client PC, and a lot of work can be submitted to the server after being processed by the client. The corresponding advantage is that the client responds quickly. The main disadvantages are as follows:

　　Only applicable to LAN. With the rapid development of the Internet, mobile office and distributed office are becoming more and more popular, which requires our system to be extensible. This way of remote access requires special technology, and at the same time, the system should be specially designed to handle distributed data.

　　The client needs to install special client software. First, it involves the workload of installation. Second, if any computer has problems, such as viruses or hardware damage, it needs to be installed or maintained. Especially when there are many branches or franchised stores, it is not the workload, but the distance. In addition, when the system software is upgraded, each client needs to be reinstalled, and its maintenance and upgrade costs are very high.

　　There are also restrictions on the operating system of the client. It may be suitable for Win98, but it cannot be used for Win2000 or Windows XP. Or it is not applicable to Microsoft's new operating system, let alone Linux, Unix, etc.

　　The advantage of B/S is that it can operate anywhere without installing any special software. As long as there is a computer that can access the Internet, the client can be used without maintenance. The expansion of the system is very easy. As long as you can access the Internet, and then the system administrator assigns a user name and password, you can use it. You can even apply online. After passing the company's internal security authentication (such as CA certificate), the system can automatically assign an account to the user to enter the system without the participation of anyone

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