A Beginner’s Guide To VPS Hosting: Uses & Advantages

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There are several advantages to these virtual servers as opposed to local ones, the first being that you no longer have to maintain your server – the owner of the virtual server will be responsible for that. Secondly, these virtual servers can be “carved up” into more than one virtual machine, meaning that you can have multiple VMs on a single server or share your server with the data from other companies. These VMs will not interact with each other or even “see” each other, despite the fact that they share the same server, and your piece of the overall server is said to be a “virtual private server” because only you and those admins who have proper permission can access it.

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Details:
http://myhosting.com/blog/2011/07/be...ng-advantages/

It's amazing how much time you save not having to maintain your server!