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The first devices that resemble modern computers given to half of the 20 st century (around 1940 - 1945), although the concept of computers and various machines like computers existed before. First electronic computers were the size of a large room, consuming as much power as several hundred personal computers. Modern computers are based on tiny integrated circuits and are millions of billions of times more capable, while occupying a fraction of space. Today, simple computer can be made small enough to fit in a wristwatch and be powered by a battery watch. Personal computers, in various forms are the icons of Information Age and are what most people think of as "a computer" However, the most common form of computers in use today is embedded computers. Embedded computers are small, simple devices that are used for other control devices - for example, can be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and games for children.

The ability to store and run lists of instructions called computer programs makes it extremely versatile and distinguishes them from computers. The Church-Turing thesis is a mathematical statement of this versatility means any computer with a certain minimum capacity is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, computers with capability and complexity ranging from that of a personal digital assistant to a supercomputer are all capable of performing the same functions of calculating sufficient time and storage capacity.