A complete circuit is a properly working circuit. It requires a SOURCE of energy, something to USE the energy, and something to CARRY the energy like a wire.
FIELDS are created by both ELECTRIC CHARGES and MAGNETS. These FIELDS can push or pull on something from a distance. These FIELD LINES show the direction of the push or the pull.
Induction is when a FIELD is created by a charge. The ELECTRONS inside the field are affected. They either MOVE AWAY or MOVE TOWARDS depending on the charge creating the field.