An annotation is an element that can be used to put comments to a flow.
In the example below, you use a Show message activity to warn end-users about unpaid orders with a pop-up message in the client. Later you want to extend this warning with an e-mail message send to the user. You can use an annotation as a reminder and put it above the current activity.
2 Common Properties
For details, see Common Properties.
3 Annotation Flow
An annotation flow is a connection that can be used to link an annotation to a flow object(s).
For example, this is an annotation flow linking an annotation and a Microflow call activity: