A computer is a machine  that controls data according to a arrange of commands
While mechanical cases by computers accept existed through with often of recorded human history, the first electronic computers were developed in the mid-20th century (1940-1945). These were the size of a large board, having equally much power as several hundred modern personal computers (PCs ).[ Modern computers based on integrated circuits  are millions to billions of times more capable than the early machines, and absorb a divide by the distance.[Deuce]  bare computers are small enough to fit into a wristwatch , and may consist powered along a assure battery . Personal computers  in their various forms are icons  of the Information Age and are what near mass intend of equally “computers”. The enclosed computers  found in many devices from MP3 players  to fighter aircraft  and from toys  to industrial robots are however the most numerous.
The ability to store and accomplish lists of instructions called programs  fixes computers extremely versatile, distinguishing them from calculators . The -ChurchTuring thesis  is a mathematical statement of this versatility: whatever computer with a sure minimum potentiality is, in principle, capable of performing the same tasks that some additional computer could execute. Consequently computers ranging from a mobile phone  to a supercomputer are all able to execute the same computational projects, afforded sufficiency time and storage capacity.