Staging lets you synchronize multiple servers in a Web farm, or copy Web site content and data between separate environments. By using Staging, you can reliably update Web content and business data from a source server to one or more destination servers.
Staging is especially useful in deployments where changes must be reviewed and approved in a design-time environment before they are published on a live, run-time Web site. Staging copies changes from a source server to a test environment where you validate the changes. After validation, Staging publishes those changes to the run-time site.