Grid computing

It is a form of distributed computing, the combination of computer resources from multiple domains applied to a common task, usually to a business problem that requires to process large amounts of data. It has been used long time before the cloud computing get in the picture but from the graph above (Google trends) it’s show that the trend of the grid computing is starting to get downward.

Utility computing

Utility concept is quite similar to cloud computing in the term of rented service such as software. It’s also some kind of computing resources such as storage, metered service. This system has low or no initial cost for hardware. Therefore utility computing always remain low in the trend.