Virtuozzo Containers is a widely used virtualization platform, which is used to create virtual servers on physical machines. Each VPS made with it is a standalone software emulation of a website hosting server, so it has its own OS. The resources are also predefined, which means that if you obtain a VPS package with certain disk space, CPU and RAM allocations, they're always at your disposal and won't be shared with another client on the physical server. The Virtuozzo Containers software is truly intuitive and easy to use, so even if you don't have a lot of experience, you'll be able to manage your entire server through a web-based graphical interface. With a couple of clicks, you can easily start/stop/reboot your virtual machine, set firewall rules, set up server-side software and do various maintenance tasks. You can also watch how much resources your sites are using live and all this info will show you whether you should have upgrading when you expand your web presence. When needed, you're able to even reset the whole VPS to its original software setup.