Microsoft Flow is a service that helps you create automated workflows between your favorite apps and services to synchronize files, get notifications, collect data, and more.
Microsoft Flow can be used to build automated workflows based on Dynamics 365 Business Central data, and for Dynamics NAV 2018 as well.
For Dynamics NAV 2018, you can use the Flow on-premises gateway to connect to Dynamics NAV data. When using Dynamics 365 Business Central, you can still use the templates and triggers related to the templates. Both Dynamics 365 Business Central and Dynamics NAV continue to support Flow actions, so Dynamics 365 Business Central and Dynamics NAV can be updated from other applications using Flow.
Still this is in development phase, however very useful and significant for business specially for operation.