Examples

White can sacrifice the exchange with Rxe6.
Recapturing lures the queen to e6, where it can be attacked with the pin Bd5.

Sometimes the rear piece can be decoyed into a pin:

White can sacrifice the exchange with Rxg8+.
Recapturing lures the king to g8, which White can use to pin and win with Bd5.

Sometimes a decoy can be combined with additional motifs:

The rook on e2 is protecting the knight on e3 and the square f2.
It is overloaded, and White can win with Rxe3!, combining decoy and deflection.
After the rook recaptures with Rxe3, it is deflected from protecting f2, and also decoyed to e3.
White can then win the rook back with the pin Bf2, having won a knight in the end.

Related combinations

Trade into pin is similar to decoy into pin, but the first move is a trade instead of a sacrifice. It is also possible to decoy a piece to a square where it can be attacked in a subsequent tactic other than a pin. And you can decoy the king into checkmate.