In NAV 2016, Microsoft introduced a proper workflow engine and some templates, opening the door for user defined workflows right out of the box (where previously, an ISV solution or customization would be required). That said, with few exceptions, such as e-mails for approval requests, the scope of the workflows was entirely within the NAV application: being triggered by an event in NAV, resulting in one or more actions and responses in NAV. Despite the limited number of pre-built workflow templates, events, and responses, it has definitely been a good selling feature for the solution.
Now imagine what you could do if NAV workflows could interact with other applications and services that your organization uses every day? Think SharePoint, CRM applications, SQL, cloud based file sharing services, Office apps (traditional and Office 365), BI.. or even social media! Actions driven by events in NAV, or triggering processes in NAV based on events in another application that drives your business.