Briefly describe the characteristics and respective advantages of c/s structure and b/s structure.

C/S structure is the abbreviation of client/server structure, which is a common network architecture. In the C/S structure, the client can access network resources through the server, and the server is responsible for processing the client's request. In contrast, the B/S architecture is the abbreviation of the browser/server architecture, which is a web application architecture. In the B/S structure, the client can access the webpage through the browser, and the server is responsible for processing the client's request. The advantage of the C/S structure is that it can provide higher efficiency and performance, because the client can run the application locally, and the server only needs to process the request sent by the client. In contrast, the advantage of the B/S structure is that it can provide higher availability, because the client can access the webpage through different browsers, and the server only needs to process the request sent by the client.