What is Hybrid Hosting and Why is it Necessary

http://www.techwench.com/what-is-hybrid-hosting-and-why-is-it-necessary/
A new term has been circling around online forums and tech sites: hybrid hosting. You’ve probably already heard about it, but if you didn’t, here’s a very short explanation: hybrid hosting is a combination of dedicated servers, clusters and new cloud hosting solutions that allows a much greater flexibility and compatibility with older applications and systems.