For more information about render nodes and connections, see About shading networks.
To show connections
Input and output connections are sometimes called upstream/downstream connections.
Displays the input connections of the selected node. Input connections are those Maya automatically creates depending on the node type.
Displays the output connections of the selected node. Output connections show the Shading Group Node. Double-click the Shading Group swatch to open its Attribute Editor.
Displays both the input and output connections of the selected node.