Site to mean a collection of users, groups, and content (workbooks, data sources) that’s walled off from any other groups and content on the same instance of Tableau Server. Another way to say this is that Tableau Server supports multi-tenancy by allowing server administrators to create sites on the server for multiple sets of users and content.
Task of Site Admin :
- Upload your logo
Configure site access
Set up the permissions structure
Get your data to Tableau Online
Analyze site usage and performance