You can choose to create additional VPCs by going to the Amazon VPC page on the AWS Management Console and selecting the "Start VPC Wizard" button. You’ll be presented with four basic network topologies. Select the one that most closely resembles the network topology that you’d like to create and choose the "Create VPC" button. Once the VPC has been created, you can begin launching Amazon EC2 instances into your VPC.
Many Web hosting companies use virtual servers for their clients, as they can offer a viable and a cost-efficient service, through it. As Virtual Servers doesn’t use the entire resources on its host computer, they can be dedicated for individual client server applications. Since, the web hosting company hosts small virtual servers on a single physical server, the cost of web hosting can be achieved at lower costs. Moreover, there will be no change in the working and services offered by the websites, which are hosted on virtual servers. As they get the same effect of being hosted on dedicated servers.
Technical knowledge: No technical knowledge is required for running a managed server. When you need to do something technical all you have to do is contact support and let the skilled technical support operators handle the rest. With an unmanaged server you need to have server administration skills and love working in the command line otherwise it will be very difficult to administer your server efficiently.
Connect to the Internet using Network Address Translation (private subnets) – Private subnets can be used for instances that you do not want to be directly addressable from the Internet. Instances in a private subnet can access the Internet without exposing their private IP address by routing their traffic through a Network Address Translation (NAT) gateway in a public subnet.
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.