Multiple Sites is a capability of the Bitrix Framework system to manage various sites from a single Control Panel.
The particulars of the multiple site system are as follows:
Unified rights for managing website modules;
Unified set of user accounts for all websites;
Unified statistics system for all websites.
Attention! According to the licensing agreement, you cannot create independent websites physically located on different servers, having a separate product kernel copy, and a separate database using one product copy.