Virtuozzo is a software application for server virtualization and automation, it creates multiple isolated Virtual Private Servers (VPS, a.k.a. VDS - Virtual Dedicated Server) on a single physical server to share hardware, licenses and management effort with maximum efficiency. Each VPS performs and executes exactly like a stand-alone server for its users and applications as it can be rebooted independently and has its own root access, users, IP addresses, memory, processes, files, applications, system libraries and configuration files.

The operation and management of VPS is identical to stand-alone server
	Each VPS has its own processes, users, files and provides full root access.
	Each VPS can have its own IP addresses, port numbers, tables, filtering and routing rules.
	Each VPS can have its own system configuration files and can install software and application which will not be affected by other VPS system.
	Each VPS can have its own versions of system libraries or modify existing ones.
	For Example: Multiple distributions of Linux can reside on the same physical server.
Quality of Service to provide dedicated SLAs for each VPS
	Standard: Includes CPU, disk space and network I/O guarantees
	Unique: Guarantees on memory - user and kernel, physical and virtual
	Unique: Guarantees on disk I/O and many other critical resources (over 20).
Virtual Private Servers (VPS) is not a Virtual Machine (VM)!
	Runs only the same OS as root OS - Linux on Linux, Windows on Windows
	10-100 times better efficiency, dynamic QoS changes for LB and more
	The new system (no software is installed) after start up consumes only about 20MB RAM (Linux) or 75MB RAM (Windows 2003)

VPS runs off-the-shelf software without any changes