What is Microsoft Dynamics 365 Business Central and NAV? And what not?

It is everything what Dynamics 365 for Financials/for Finance and Operations, Business Edition was. That means a modern cloud based software-as-a-service solution, fully integrated to Office, PowerApps, Microsoft Flow and Power BI. But it is also a full Microsoft Dynamics NAV, where the previous version only had a subset of NAV. Dynamics 365 Business Central…