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According to weikipedia, "A computer is a machine that manipulates data according to a set of instructions."
Wel it may have started out that way, but we all know very well that they do a lot more today. They are creeping into all of our lives in ways that we cannot imagine. Often we even use the without realising that we are. For example, I had my wife's ten year old car in the garage for repairs recently. It turned out that the problem was that there was oil leaking on the computer chip that controlled the flow of fuel. Imagine, we had been driving that car, a very small car that barely holds us and our children, for years without knowing that it was controlled by a computer. I almost argued with the dealer who told me but I thought better of it. What do I know about cars, right.
Computers today store and execute vast lists of instructions called programs. This makes computers extremely versatile and distinguishes them from basic calculators. The Church–Turing thesis is a mathematical statement of this versatility: any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore computers ranging from a mobile phone to a supercomputer are all able to perform the same computational tasks, given enough time and storage capacity.