Microsoft Flow is a public cloud service to help individuals and teams to set up automated workflows.
Microsoft Flow is a public cloud service to help individuals and teams to set up automated workflows between their favorite apps and services to synchronize, get notifications, collect data, and more.
Microsoft Flow is being licensed to most SharePoint Online tenants (E1, E3, E5, Plan1/ Plan2 and Essentials).
For more details check https://flow.microsoft.com