Concepts and differences between the C/S architecture and the B/S architecture

C/S architecture
The C/S architecture is a typical two-layer architecture. The entire process is Client/Server, that is, the Client Server architecture, the client contains one or more programs running on the user's computer, and there are two types of servers. One is the database server, and the client accesses the data on the server through the database connection; the other is the Socket server, where the program communicates with the client program through the Socket.
The C/S architecture can also be seen as a fat client architecture. Because the client needs to implement the vast majority of business logic and interface display. In this architecture, the client must bear a lot of pressure, because the display logic and transaction processing are included in it, through the interaction with the database (usually the implementation of SQL or stored procedures) to achieve persistent data, in order to meet the needs of the actual project.
Advantages and disadvantages of the C/S architecture
Advantages:
1. the interfaces and operations of the C/S architecture are rich.
2. Security performance can be easily guaranteed, and it is not difficult to implement multi-layer authentication.
3. Because there is only one layer of interaction, the response speed is faster.
Disadvantages:
1. Narrow application area, usually used in LAN.
2. Fixed user groups. Because the program needs to be installed before it can be used, it is not suitable for some unknown users.
3. high maintenance costs. In case of an upgrade, all client programs need to be changed.
B/S architecture
The B/S architecture is called Browser/Server, that is, the Browser/Server structure. Browser refers to a Web Browser. A very small number of transaction logic are implemented at the front end, but the main transaction logic is implemented at the server end. The Browser client, WebApp server, and DB constitute the so-called three-tier architecture. B/S architecture systems do not require special installation, only Web browsers.
In the B/S architecture, the display logic is handed over to the Web browser, and the transaction processing logic is placed on the WebApp. This avoids the huge fat client and reduces the pressure on the client. Because the client contains few logics, it is also becoming a thin client.
Advantages and disadvantages of B/S architecture
Advantages:
1) the client does not need to be installed. You can use a Web browser.
2) The BS architecture can be directly deployed on the Wide Area Network. with certain permission control, the BS architecture can achieve multi-customer access with strong interaction.
3) Upgrade the BS architecture without upgrading multiple clients.
Disadvantages:
1) The BS architecture is unsatisfactory across browsers.
2) It takes a lot of effort to achieve the performance of the CS program.
3) high design costs are required in terms of speed and security, which is the biggest problem of BS architecture.
4) the interaction between the client and server is in the request-response mode. Usually, the page needs to be refreshed, which is not desired by the customer. (This problem has been mitigated to some extent after Ajax is popular)