A VPS which is dynamic (that is, it can be changed at runtime) is often referred to as a cloud server
. Key attributes for this are:
Additional hardware resources can be added at runtime (CPU, RAM)
Server can be moved to other hardware while the server is running (automatically according to load in some cases)
A virtual private server
(VPS) is a virtual machine provided by an Internet hosting service. Although a VPS runs in software on the same physical computer as other customers' virtual machines, it is in many respects functionally equivalent to a separate physical computer. A VPS is dedicated to the individual customer's needs, has the privacy of a separate physical computer, and can be configured to run server software.
If you search some good and reliable cloud hosting, I can recommend to you nice Swiss servers
. Their support is 24/7.