A single pole switch is used when there is only one switch controlling a light, like in a backyard shed. Installing a single pole switch is a simple electrical project because the power comes in the box, goes thru the switch and then goes to the light.
brief how to
Strip about 9-10 inches of sheathing from the end of the incoming and outgoing cables. Bring the cables and wires into the box until about 1/2" of the sheathing is inside the box. Remove the insulation from the last inch of all four of the wires. Use the holes in the wirestrippers or needle nose pliers to form a hook at the ends of the black wires
Attach the black wires to the brass terminals on the switch, make sure the hook on the wire ends wraps clockwise around the terminal.
Attach the white wire to the switch on the opposite side of the switch from the black wire.
Attach the ground wire to the switch ground termial. It is usually the green colored screw.
If using a metal box attach the two ground wires together and add two 6 inch pigtails, one gets attached to the metal box and one gets attached to the switch. This is typically used in commercial construction and not necessary for backyard sheds.
Push the wires into the box and the switch to the face of the box. Use the two screws that come with the switch to screw it to the switch box. Turn the breaker on and test the circuit.