1.B / S architecture
Browser-Server, the browser and server architecture. It contains the client browser, web application server, database server software system. Users need only a browser to access the service. System updates, you can just update the server, no need to update the browser (such as Baidu, Taobao, microblogging, etc.)
2.C / S architecture
Client-Server, the client and server architecture, this structure and B / S is the most significant distinction installs the client to access the application through a client program. So when updating, it is necessary to update the server, but also keep new clients (such as micro-channel, qq, etc.)