Hello all.

I'm kind of a newbie when it comes to VMWare.
I've tested VMWare Workstation and right now I have VMWare Server (In production) and I'm testing VMWare ESXi 3.5.

I explored the web and still have my doubts regarding VSphere and VCenter.

We're looking to migrate our VM servers (currently about 10 or 12) to a more robust and complete platform such as ESX.
Of course, we're looking to administrate them the best possible way, guarantying bussiness continuity (VCB) and high performance among others.

I've read about VSphere and VCenter, including features, licensing and pricing.
Still, I don't understand the difference (technically speaking) between them.

I mean, suppose I have 5 ESX servers. From what I get, VSphere is like an agent or application that groups them all and VCenter Server is the administration center for all the features.

Is this correct or am I misunderstanding something?

If this is correct, this would mean that I could have VC Foundation without having to acquire VSphere.
What happens then to the features offered by VSphere such as VCB (The one we're most interested in)?

Thanks for your time,
Jorge G.