Data Source is a Tableau Hyper file

Tableau is a business intelligence software that allows anyone to connect to data in a few clicks, then visualize and create interactive, shareable dashboards with a few more. It's easy enough that any Excel user can learn it, but powerful enough to satisfy even the most complex analytical problems. Securely sharing your findings with others only takes seconds.

The result is BI software that you can trust to actually deliver answers to the people that need them.

http://www.tableausoftware.com/business-intelligence

Under the hood, Hyper is the technology that now powers Tableau’s data engine. The data engine is what handles opening, creating, refreshing, and querying your extracts.

https://www.tableau.com/about/blog/2018/1/extracts-hyper-speed-what-you-need-know-79397