B/S and C/S

The C/S structure, that is, the Client/Server structure, is a well-known software system architecture. by assigning tasks to the client and server, reduces the communication overhead of the system and makes full use of the advantages of the hardware environment on both ends.
The B/S structure, that is, the Browser/Server structure, is a change or improved structure of the C/S structure with the rise of Internet technology. In this structure, the user interface is fully implemented through the WWW browser. Some transaction logic is implemented at the front end, but the main transaction logic is implemented at the server end, forming a so-called 3-tier structure. B/S structure is a new software system construction technology, which uses sophisticated and universal browser technology to implement powerful functions that originally required complex specialized software, and saves development costs.

In plain language, the two structures are composed of the UI Layer and the business processing layer. The business processing layer is generally called the server.

C/s is the Client/Server. Its UI and business processing layer are placed in the same memory, which is relatively fast, but must be installed on the client. B/S is Browser/Server. We can literally see that this structure is based on browser. In fact, this structure separates the UI from the business processing layer and replaces the UI with the browser, you don't need to install anything on the client. You only have a browser.