对于国际网络通信，我们需要网络浏览器和网络服务器。 Web 浏览器和服务器在建立连接方面起着重要作用。客户端发送对 Web 文档或服务的请求。从 Web 浏览器发送到 Web 服务器的消息称为 HTTP 请求。当 Web 服务器收到请求时，它会搜索其商店以找到合适的页面。如果 Web 服务器能够定位页面，它会打包成包含在其中的 HTML(使用某种传输层协议)，将这些包寻址到浏览器(使用 HTTP)，然后通过网络将它们传回。
如果 Web 服务器无法找到请求的页面，它会发送一个包含错误消息的页面(即错误 404 – 未找到页面)，然后打包并将该页面分派到浏览器。服务器由 Web 浏览器接收到的此消息称为 HTTP 响应。
Web 浏览器和 Web 服务器之间的主要区别是：
| Web Browser | Web Server |
|---|---|
| Web Browser is an Application program that displays a World wide web document. It usually uses the internet service to access the document. | Web server is a program or the computer that provide services to other programs called client. |
| The Web browser requests the server for the web documents and services. | The Web server accepts, approve and respond to the request made by the web browser for a web document or services. |
| The web browser act as an interface between the server and the client and displays a web document to the client. | The web server is a software or a system which maintain the web applications, generate response and accept clients data. |
| The web browser sends an HTTP request and gets an HTTP response. | The web server gets HTTP requests and send HTTP responses. |
| Doesn’t exist any processing model for the web browser. | There exist three types of processing models for web server i.e Process-based, Thread based and Hybrid. |
| Web browser stores the cookies for different websites. | Web servers provide an area to store and organize the pages of the website. |
| The web browser is installed on the client computer. | The web server can be a remote machine placed at the other side of your network or even on the other end of the globe, or it is your very own personal computer at home. |