The Sensor Shield's purpose is make it easy to connect cables and devices to the correct Arduino pins. It simply connects the Arduino pins to many connectors It can connect to various modules like sensors, servos, relays, buttons, potentiometers Each functional module has buckled port with VCC, GND and Output, which has corresponding port on the Sensor Shield, connected with a plain 2.54mm dual-female cable you may start playing already. Buckled brick cables are like cement for bricks, make the connections easier, secure and more professional looking.