Squid是一个缓存internet数据的一个软件，它接收用户的下载申请，并自动处理所下载的数据。也就是说，当一个用户象要下载一个主页时，它向Squid发出一个申请，要Squid替它下载，然后Squid 连接所申请网站并请求该主页，接着把该主页传给用户同时保留一个备份，当别的用户申请同样的页面时，Squid把保存的备份立即传给用户，使用户觉得速度相当快。

-Squid is a caching internet data, a software that users download the application to receive and automatically process the downloaded data. In other words, when a user like a page to download, it sent an application to the Squid, Squid crispness to download, and then connect the Squid web site and request the application home page, then to the home page to the user while retaining a backup, When the other user to apply the same page, Squid to save the backup immediately passed to the user, allowing users to feel very fast.