Modern computers are very different from early computers. They are now very powerful machines that are able to do billions of calculations every second. Most people have used a personal computer in their home or at work. Computers are useful for many different jobs where automatic functions are useful. Some examples are controlling traffic lights, vehicle computers, security systems, Washing machines and Digital Televisions.A person (called a user) can control a computer by telling it to do things. Some ways of controlling a computer are with a keyboard, mouse, buttons, touch screen. Some very new computers can also be controlled with voice commands or hand gestures.
Computers can be designed to do anything with information. Computers are used to control factories, which in the past were controlled by humans. They are also in homes, where they are used for things such as listening to music, reading the news, and writing.
Modern computers are electronic machines. A computer is only useful if it has both hardware and software. Hardware is the physical parts the computer is made of - for example keyboard, mouse, screen, tower. Software is the computer programs (mathematical instructions). Software uses the hardware by taking input and changing it in to useful output.Computers are able to do billions of calculations each second. They can do mathematical arithmetic very quickly but computers do not really "think". They only follow the instructions in their software programs.
Computer programs are designed or written by computer programmers. Computer programs can be written in the computer's own language called machine code. Machine Code has only a few instructions and is based on logic and Mathematical arithmetic. Using machine code is difficult for most human programmers.
Today, programmers usually write programs using a programming language like C++, Java or BASIC. These programming languages can be translated in to machine code later using a program called a compiler.
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