What Computer is
A device that runs programs for displaying and manipulating text, graphics, symbols, audio, video, and numbers.
A computer accepts information in the form of digital data. Complex computers also include the means for storing data (including software programs). A program may be built into the computer (in the logic circuitry, located on the microprocessors), or may be loaded into the computer's storage and then started by an administrator or user. Today's computers have both kinds of programming.
Most histories of the modern computer begin with the Analytical Engine envisioned by Charles Babbage, who followed the mathematical ideas of George Boole (see: Boolean logic), the mathematician who first stated the principles of logic inherent in today's digital computer. Babbage's assistant and collaborator, Ada Lovelace, is said to have introduced the ideas of program loops and subroutines and she is sometimes considered the first programmer.
Modern computers inherently follow the ideas of the stored program laid out by John von Neumann in 1945. Essentially, the program is read by the computer one instruction at a time; an operation is performed, then the computer reads the next instruction, and so on.
Prior to the PC, which is small and affordable, computers were large and expensive. Companies enabled multiple users to share the computer resources through attached terminals. Starting in the late 1980's, technological advances made it feasible to build smaller-sized computers that individuals could use independently, whether at work or at home. These were then "networked into" the larger system.
Recently, computers and programs have been devised that allow multiple programs (and computers) to work on the same problem, at the same time, in parallel (see: network computing). For many users, though, a computer acts only as a "glorified typewriter," used to cut-and-paste objects and to save documents. But computers can also perform a variety of other tasks, such as accounting and desktop publishing.
A computer system includes peripherals, such as hard and floppy disk drives, a monitor, a mouse, the operating system, software, and a printer. All of these components are designed to work together. You need a computer to access the Internet, browse the Web, and send or receive e-mail, among other things.
The meaning of Server
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).
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