Zones  

Zones provide a new isolation primitive for the Solaris OS, which is secure, flexible, scalable and lightweight: virtualized OS services which look like different Solaris instances. Together with the existing Solaris Resource management framework, Solaris Zones forms the basis of Solaris Containers. 

The System Administration Guide: Solaris Containers--Resource Management and Solaris Zones describes how to configure, install and administer Zones, along with a wealth of other information about resource management on Solaris.