The first devices that resemble modern computers date to the mid 20th century (1940-1945), although the computer concept and various machines similar to computers existed earlier. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers (PC). Modern computers are based on small integrated circuits and are millions to billions of times more capable while a fraction of the space.
Today, simple computers may be made small enough for a wristwatch and be powered from a watch battery. Personal computers, in various forms are icons of the Information Age and are what most people think as a "computer", but the most common form of computer in use today is the embedded computer. Embedded computers are small, simple devices that are used for other devices - for example, they can be found in machines ranging from fighter aircraft to industrial robots, digital cameras and toys.
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