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A drawing of a usual modern desktop computer. A computer is a programmable machine. Modern computers are very different from early computers. They can do billions of calculations per second. Some very sophisticated computers can also be controlled with voice commands or hand gestures or even brain signals through electrodes implanted in the brain or along nerves.
Computers can be designed to do almost anything with information. Computers are used to control large and small machines which in the past were controlled by humans. They only follow the instructions in their software programs. These programming languages are more like the language with which one talks and writes every day. A computer is a programmable electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations, all under the control of software. Mainframes, desktop and laptop computers, tablets and smartphones are some of the different types of computers.