A computer is somewhat similar to a human being. We consist not only of a brain giving us the ability to think and to memorize, but also of the eyes, the ears, the hands etc. which connect us with the external world. A computer needs also additional external devices to communicate with its surroundings.
For a computer, the Input devices have the same meaning as the senses for us. Just as we reach the information from our surroundings through our eyes, ears, touch, smell etc., a computer uses the input devices to get data.
There is a plenty of input devices available today. The most important are the keyboard and the mouse which I will explain separately.
Let's mention here only some of the input devices.
Through the output devices we get the results of the computation made on all the input data. An output device is for a computer something like our mouth for us or our hands with which we can write.
The most important output device is the computer screen or display. I will speak about it separately.
Some other output devices are:
We can say that a computer necessarily needs the standard input and output devices to be completely applicable. These devices are keyboard, mouse and display. I introduce all of them separately.