As a result of VPS hosting's hybrid nature, its cost isn't quite as low as shared hosts' fees, but it's not nearly as high as dedicated hosts' fees. You can expect to pay between $20 per month and $100 per month, depending on the configuration. Shared web hosting, on the other hand, is extremely cheap hosting; you can often set up shop for less than $10 per month. Dedicated web hosting will typically set you back $100 per month or more.
A virtual machine (VM) is automatically assigned a private IP address from a range that you specify, based on the subnet it is deployed in. The address is retained by a VM until the VM is deleted. Azure dynamically assigns the next available private IP address from the subnet you create a VM in. Assign a static IP address if you want a specific IP address from the subnet assigned to the VM.
Partitioning a single server to appear as multiple servers has been increasingly common on microcomputers since the launch of VMware ESX Server in 2001. The physical server typically runs a hypervisor which is tasked with creating, releasing, and managing the resources of "guest" operating systems, or virtual machines. These guest operating systems are allocated a share of resources of the physical server, typically in a manner in which the guest is not aware of any other physical resources save for those allocated to it by the hypervisor. As a VPS runs its own copy of its operating system, customers have superuser-level access to that operating system instance, and can install almost any software that runs on the OS; however, due to the number of virtualization clients typically running on a single machine, a VPS generally has limited processor time, RAM, and disk space.