What Server is
A host computer on a network. It houses information and responds to requests for information (for example, it houses Web sites and executes their links to other Web sites). The term "server" also refers to the software that makes the act of "serving information" possible. Commerce servers, for example, use software to run the main functions of an e-commerce Web site, such as product display, online ordering, and inventory management (you'll also hear this described as shopping cart technology). A server is the control computer on a LAN, meaning it controls the software, access to printers, and other parts of the network (usually accompanied by workstations that "share the load"). A server may be dedicated (where its sole purpose is to be the server) or non-dedicated (where in addition to being the server, it can be used for basic computing purposes).
The meaning of Tag
In Web programming languages, it is the code that describes a command or instruction so that a Web browser will be able to interpret and display it. In order to link an image or word on a Web page, you must put specific tags around the image or word in the code. This is known as basic HTML and it's pretty easy. Look up the HTML definition for more info.
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