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In the ever changing world of computers, three different types of computing devices have emerged. Each device can be extremely useful and millions of people rely on them everyday, not only for their personal use but for business applications as well. Modern civilization is based on the sharing of information and the ability to communicate with one another. Simply put, computers are essential to our everyday lives. Whether you need a computer small enough to fit in your pocket, or powerful enough to create movies, there is a computer to fit your needs. The consumer computer revolution began with the coming of the desktop computer. These computers are literally small enough to fit on a desktop and are one of the most popular types of computer with consumers. In the past these machines were very expensive.