Wires transfer property values between input and output ports and they help you visualize the relationships amongst your nodes in the graph.

Wires establish the path by which a node’s property value travels to and from ports. For example, a point will not be generated in the view unless a coordinate system is defined even if it has its XTranslation, YTranslation, and ZTranslation defined. The point requires baseCS to define its CoordinateSystem; you can connect the two ports with a wire. Once a wire connects the two ports, then the point will be generated. In addition to generating the point in the view, the wire creates a visual relationship, between the coordinate system and the point, in the graph.