Comparison of cluster, Grid and Cloud Computing using three different approaches

Nowadays IT world talks too much about the terms of the cluster, grid and the cloud. Increasing attention to these terms not only makes them important but also researchers focus on these technologies in many areas. In fact that they deserve this attention and importance, but majority of the IT people are confusing what they mean and how they differ in using of and their implications for IT perspective. Therefore, this paper discusses the differences and similarities of these terms.