The primary mechanism for sharing data amongst different objects in a Grasshopper file. Wires always connect the output of one parameter with the input of another parameter, thus establishing data inheritance.

Wires look different depending on the kind of data they transmit. Dashed lines carry no data whatsoever, single solid lines carry a single data item, double solid lines carry a collection of at least two items, and double dashed lines carry at least two separate collections of items.