A computer is a device for manipulate data according to a list of instructions. Computers take many physical forms. Early electronic computers were the size of a large room, consuming a lot power as more than a few hundred modern personal computers. Today, computers can be made little enough to fit into a wrist watch and be motorized from a watch battery. Society has come to be familiar with personal computers and their portable corresponding, the laptop computer, as icons of the information age; they are what most people think of as "a computer".
However, the most common form of computer in use today is by far the fixed computer. Embedded computers are small, simple devices that are frequently used to control other devices—for example; they may be found in machines range from fighter aircraft to industrial robots, digital cameras, and even children's toys.
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