What exactly are http triggers and actions in the office 365 changes?

[Erdem]

We integrate cognito forms with microsoft flow and sharepoint and do some other stuff with flow regarding sharepoint lists and sending emails.

Now I see the following email:

"Starting February 1, 2019, the following capabilities will require a PowerApps or Microsoft Flow Plan 1 or Plan 2 license: - Integration of on-premises data through the on-premises data gateway - Custom connectors - HTTP triggers and actions inside Microsoft Flow"

Wat exactly are http triggers and actions here? Is the cognito forms also included in the HTTP triggers and actions that Microsoft is talking about?

regards,

[Gail]

I'm also looking for a better idea of what  "HTTP triggers and actions inside Microsoft Flow" includes.  Does that include notifications of sharepoint list changes, changes to sharepoint list, triggers based on emails received, etc...