Users are guaranteed the resources on their VPS server for their web hosting accounts. This means that your account will always be allocated the set amount of RAM, CPU, and disk space you've chosen regardless of what other users on the server are doing. This allows for greater stability and performance of your website, applications, and email. You also do not share the operating system with any other users, providing better security for your website files.
HostGator gained points for uptime monitoring and regular backups, along with free cPanel or Plesk. We liked that SSH is available for the more technically inclined site operators and that dedicated IP addresses could be purchased. We did take points off because it's sometimes difficult to tell what the price is once promotional plans run their course. That said, with a generous 45-day money back guarantee, there's a hosting solution for almost everyone at HostGator.
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.