Nowadays, we live in a world of technology in which the use of computers is essential. Computers can be used for so many activities and purposes that we cannot even imagine not being able to have access to a computer which we might work with. We use computers not only at work and at school but also at home for all sorts of activities which we enjoy doing in our spare time. Computers have been very much improved in the last few years because there have been many changes made to their components.