Joomla Multi Sites allows multiple domain names or sites to have their own joomla configuration file using the same joomla installation. Share the user (Single Sign-in), share extension, replicate into other DB, multisite install/uninstall facilities, ...
Only 1 Space for all your websites !
Share the content of some extensions
* Share the users * Share = single data occurence. So, no need of syncrhonization
Rapid website creation and replication
* Websites can be created with different domain, subdomain or subdirectories. * Websites can also be created from the front-end.