A VPN server is a machine on the internet that runs VPN software. A VPN client can connect to that server, and all data that travels between the client and the server is encrypted. If you wanted to connect to a website on the internet but didn’t want anyone, even your ISP, to see which site it was or the data your were sending, you could connect via a VPN. All an observer would be able to see is that you connected to the VPN server.
A virtual private server (VPS), also called a virtual dedicated server (VDS), is a virtual server that appears to the user as a dedicated server, but that is actually installed on a computer serving multiple websites. A single computer can have several VPSs, each one with its own operating system (OS) that runs the hosting software for a particular user.
For plans or packages featuring unlimited websites, domains, or email accounts, we do not enforce any official limitations. Customers are able to utilize as many of these features as they wish. That said, these are of course not infinite resources and there are inherent maximums associated with the technology powering them. For example, while email account creation is unlimited, these rely on the file storage available on the account. Therefore customers need to be operating within the Terms of Service to ensure resources are available to fully enable email functionality. Customers operating within the Terms of Service have yet to come up against technical boundaries for email, domains, or websites.
Perhaps the best way to approach the virtual server is the idea of a virtual machine. A VM allows you to run an emulation of a computer within your computer, drawing on the resources of the physical one –  disk space, RAM, CPU, etc. This tactic allows you to run an entirely separate operating system (OS) solely for the purposes of the VM, even if its type and version of OS are identical to what’s on your hardware.
Amazon EC2 is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. You can use Amazon EC2 for a variety of applications, including websites and web applications, development and test environments, and even back-up and recovery scenarios. Amazon EC2 offers a wide selection of instance types with varying combinations of CPU, memory, storage, and networking capacity that you can use to meet the unique needs of your applications.

The number of sites that you host on the server, the number of databases or mailboxes are not limited on a VPS, moreover, Hostens does not block any ports. VPS is a separate server that gives its owner the possibility to customize its settings. On shared hosting, you cannot choose any control panel or any software, as the provider has already configured it. As VPS provides full access (SSH) to VPS hosting, the customer is free to install, manage and control any software that is compatible with server virtualization.
A Virtual Private Server is created by partitioning the physical server into multiple mini servers, made possible by the technology of Server Virtualization. The term Virtual Server is widely used by Internet hosting services and it is often used to refer a Virtual Machine. A Virtual Private Server VPS works in a federated environment used by other virtual machines. But in all aspects the functionality is equivalent to that of an environment created by a physical computer dedicated to individual customer needs. It offers the same privacy, which is seen in separate physical computer environment, configured to run server software. Virtual Private Servers are also known with the synonyms Virtual Root Server VRS and Virtual Dedicated Server VDS.
It works quite like shared hosting, as both of them are virtual hosting. However, shared hosting does not allow to extend or modify server settings. VPS hosting is more like a dedicated physical server on a virtual platform. You can manage and set up VPS for your requirements, as it is a separate server. Also, VPS server can be operated by a control panel that can be installed with a few clicks from the client system or the terminal command line. It means that you can even choose the same control panel as it is on shared hosting.
Virtual servers are scalable and come with dedicated core and memory allocations. They are a great option if you are looking for compute resources, that can be added in minutes, with access to features like image templates. The hypervisor is fully managed by IBM Cloud, and you can perform configuration and management tasks by using both the IBM Cloud customer portal and the API. Virtual servers are deployed to the same VLANs as physical servers, allowing you to spread workloads across virtual servers and bare metal servers while maintaining interoperability. Virtual servers are fully customizable when you 
order them, with options to scale up as your compute needs grow.
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.
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