A VPS hosting provider relies on virtualization software, called a hypervisor, to abstract resources on a physical server and provide customers with access to an emulated server, called a virtual machine (VM). Each virtual machine runs a complete operating system, and has restricted access to a portion of the physical server's compute, memory and storage resources. Customers have access to the VM's OS, but not to the physical server.
This is a low cost option for the hosting company and they will usually offer some kind of data protection using a RAID system where data is copied across multiple disks. This is an entry level solution but one issue is that the server itself represents a single point of failure. It could be that the power supply fails which brings the server down for example.

Lastly, arguably the most significant advantage of VPS hosting comes at the highest price. You get root access and unparalleled control of the resources granted. That means that you can install a wide range of operating systems, work on resource-heavy projects and do much more, than with shared hosting. But sadly, the customer support team will only help you with questions relating to VPS hosting management and other back-end related queries.
With unmanaged VPS hosting, the cost is also much cheaper. It is not uncommon to find $10 unmanaged VPS plans because the web host does not have to pay for a cPanel or Plesk license and are able to minimize costs. Also, since the web host does not provide software and account support for an unmanaged VPS, the host also saves money on customer support. In the end, you'll have VPS hosting that is typically $20-30 cheaper than a managed VPS solution.
Ubuntu is one of the top OS picks for web servers on the planet. The open-source nature of Ubuntu lends itself to be a perfect tool for users that want a flexible and stable environment. This OS is ideal for any online project that demands high security and a customizable stack. Being the 3rd most common OS Ubuntu naturally boasts about a massive community. You can be sure, that whatever issues you may run into, there will be no shortage of help online!
The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance.