The computer is a machine or tool that is capable of processing data using a parable says that she is a factory which needs an input of raw materials or semi - processed and an output of products finishes meaning that the computer needs to be introduced to whom the UCP data processed and once completed need to be removed from the computer for use by the user.

This requires that exist as in any process channels of input output and if any of these channels are blocked then the process would be interrupted. Everyone has a computer but information data are input data to be produced or the type of work to be performed not us any good nor will it be useful if the data once processed can not be viewed printed or analyzed in an external drive.

If the CPU is the heart of the computer then the input and output devices are their eyes ears mouth and hands. From the standpoint of user input devices and output are as important as UCP in fact are even more so because if it was purchased and configured the computer by issuing the CPU is available.

However devices E / S are parties with which it interacts, so their ability to use them effectively is critical for the benefit you can get the system completely.

The mechanical part is formed basically by electromechanical devices controlled by electronics. The speed of operation of a peripheral and the time elapsed between failures usually come taxes by mechanical elements.