The B/S (Browser/Server) structure is the browser/server structure. It is a change or improved structure of C/S structure with the rise of Internet technology. In this structure, the user's working interface is implemented through a browser to implement a small portion of the transaction logic in the browser, but the primary transaction logic is implemented on the server side (Server). This greatly simplifies the client computer load, reduces the cost and workload of system maintenance and upgrade, and reduces the overall cost of users.Unlike the two-tier architecture of the client/server structure, the browser/server pattern uses a three-tier architecture of browser, server, and database.