Global Hosting Talk

I have been reading some articles about cloud computing and even saw some companies advertising on adwords ( some of them seems to be selling simple VPS ). But i still didn’t got how i can build one.

How does it work in a techinal way?

If i have a openvz container that is moved to other host server when the current one fails, is this considered cloud computing? ( from the user perspective, the service is still up, right? )

Are there specific softwares for cloud computing?

Thanks,

Fernando.