You can easily customize the network configuration for your Amazon VPC. For example, you can create a public-facing subnet for your web servers that has access to the Internet, and place your backend systems such as databases or application servers in a private-facing subnet with no Internet access. You can leverage multiple layers of security, including security groups and network access control lists, to help control access to Amazon EC2 instances in each subnet.

The concept of a virtual private server can be better explained as a virtual machine that caters to the individual needs of a user just as a separate physical computer that is dedicated to a particular user. The virtual dedicated server provides the same functionality and privacy as that of a normal physical computer. A number of virtual private servers can be installed on a single physical server with each one running its own operating system.
In the world of web hosting, there are many options for how to manage the computers that run a website, and it can be difficult to figure out what might be best for you. Since enterprise websites require the full resources of a server (or multiple servers) to ensure optimal performance for the site’s users, it’s important to make sure the best hosting option is chosen. When deciding upon those options, the choice often comes down to one of two possible approaches: dedicated or virtual hosting. Should you use your own physical server dedicated solely to you, or should you use a virtual server, which uses software to emulate a physical server on a virtual host? Let’s look at the pros and cons of each option:
A VPS runs its own copy of an operating system (OS), and customers may have superuser-level access to that operating system instance, so they can install almost any software that runs on that OS. For many purposes they are functionally equivalent to a dedicated physical server, and being software-defined, are able to be much more easily created and configured. They are priced much lower than an equivalent physical server. However, as they share the underlying physical hardware with other VPSes, performance may be lower, depending on the workload of any other executing virtual machines.[1]
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