The latest version of CSS is the CSS3 version which basically differs from CSS2 in the incorporation of Modules and other changes. Modules enable the designing to be done in a lesser time with more ease while updating individual features and specifications. The CSS3 version supports many more browsers than CSS2, but be sure to test it on all operating systems and browsers.
A ' web server ' is generally any server program which serves content using the http (or https ) protocols. These servers tend to listen on specific ports (80, or 443). The clients for these are generally web browsers like Chrome, Firefox or Internet Explorer. This video explains the differences between a Web and an Application Server
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