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From their website:
Simply put, Capistrano is a tool for automating tasks on one or more remote servers. It executes commands in parallel on all targeted machines, and provides a mechanism for rolling back changes across multiple machines. It is ideal for anyone doing any kind of system administration, either professionally or incidentally.

* Great for automating tasks via SSH on remote servers, like software installation, application deployment, configuration management, ad hoc server monitoring, and more.
* Ideal for system administrators, whether professional or incidental.
* Easy to customize. Its configuration files use the Ruby programming language syntax, but you don't need to know Ruby to do most things with Capistrano.
* Easy to extend. Capistrano is written in the Ruby programming language, and may be extended easily by writing additional Ruby modules.