Alternatively, users can configure their Gmail accounts to use POP3 to retrieve mail that is temporarily stored on your VPS. This is sometimes more reliable than forwarding, but the disadvantage is the polling interval can cause incoming mail to be delayed by up to an hour, which is sometimes very annoying. Using POP3 to retrieve mail to a personal PC is even worse - you can easily lose your entire mail archive (because pst files are hard to back up) and you can't access it from a phone.
VPS hosting is a very scalable solution by its very nature. Virtual machines don’t depend on their physical server; as we have said, they don’t even recognize it exists. If a VPS needs to be upgraded or downgraded, all a hosting provider needs to do is to adjust the limits for this VPS in a hypervisor. After reboot a guest OS will work like nothing happened, using new hardware quotas. This comes in handy if you are not able to estimate the technical specifications you need before you run some tests. Also, if you have a seasonal business (e.g. you sell beach equipment), you can choose to have a more powerful server during your peak demand season and a cheaper one for the rest of the year.
Some virtualization platforms, primarily "bare metal" hypervisors, do not permit the realtime allocation or alteration of system resources to VPS partitions. Managed VPS plans including cPanel offer the AWStats service for viewing metered bandwidth on web traffic by month & day. Google Webmaster Tools is another good resource for monitoring and calculating the average traffic usage for a website by geo-location, time of day, weekend use, holiday rates, etc.
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.[2]

The current trend in Linux web server OS distributions is for extremely lightweight installation requirements and integration with containers for elastic scaling of big data applications. Rancher and CoreOS both work with Docker and Kubernetes as well as other cloud orchestration platforms like OpenStack, CloudStack, CloudFoundry, OpenShift, Mesosphere, etc. Lightweight OS installations increase the number of virtual machines that can be created on data center hardware, leading to greater efficiency in production environments.
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The hypervisor provides each guest machine (each website using the VPS) with a virtual operating system and takes care of managing and executing guest operating systems. This process makes the most effective use of computer resources such as network bandwidth, memory space and processor cycles. For this reason, a hypervisor also goes by the name of a virtual machine monitor (VMM).
It is rumored that Linux servers are more secure than Windows. Well, it depends on who implements security enhancements on a VPS. There is plenty of information on the Internet about securing both Windows and Linux servers. One of the Windows server weak spots, Active Directory, can be protected using several simple steps; Linux distros have SELinux control system and other security tools. It is possible to maintain a decent level of security on any platform; however, it requires server administration skills.
Shared hosting is not meant for websites that use large amounts of RAM. As your website grows and you add more and more content, you will start to see a decrease in your website’s load times. As soon as this happens, it’s an indication that you are maxing out your limits. Upgrading to a VPS will enable you to scale your website without having to worry about slow load times.

The most obvious and popular reason for a VPS is to run a single website, or multiple websites. However, you can use them for pretty much anything that requires access to the internet – such as a web application like Nextcloud to run your own Dropbox alternative – or to create your own virtual private network to better secure the internet connection of your PCs and mobile devices.