And I don't know all the logistics and I forget what it is called, and correct me if I am wrong but I am sure I have heard that it can appear as one big server when it is actually people allowing to share space on their own computers for the use of one website, thereby increasing the amount of storage space (and bandwidth ) without having to increase the money spent on the upkeep of their own hardware.

Well MrsWillyMammoth since you helped me out with the term 'Troll' allow me to reciprocate.    

I think the term you are looking for is peer-to-peer (P2P). ( http://en.wikipedia.org/wiki/Peer-to-peer )

Although a cluster ( http://en.wikipedia.org/wiki/Cluster_computing ) may seem similar to a P2P, in that the processing and storage capacities are splitt between multiple computers, there are very big differences, like a cluster is usually contained within a LAN.  Sorry guys I've probably boored you enough.

Thaddeous
Aspiring Geek and local
we now return you to your regularly scheduled