Connection
A visible relationship between objects that shows how objects relate to each other. This graphical representation of a relationship is created during modeling.
A connection is usually represented by lines in the modeling area. If a direction is relevant, the line is added an arrow. One example is the connection of the is predecessor of type between functions in models of the Event-driven process chain type.

Implicit connection
Implicit connections are created if objects are placed within objects. The difference between implicit connections and implicit relationships, such as assignments, is that an implicit connection can be represented by a line in the modeling area. This line is displayed, if you drag an object from another object down into the free area of the modeling area.
Example of implicit connections:
Place a function on another function in a model of the Event-driven process chain type.
