Examples

White has just castled. This was a terrible mistake, because the diagonal g1-a7 is weak. Black can now win by trading knights with 1...Nxd4. The queen has to recapture with 2.Qxd4, and is lured to d4, where it can be pinned with 2...Bc5.

Black can trade rooks with 1...Rxf5+. After White recaptures with 2.Nxf5, the knight is lured to f5, where it can be pinned with 2...Rf8. The knight is lost, there is no way to defend it.

Related combinations

It is also possible to use a trade to lure a piece to a square where it can be attacked in a subsequent tactic other than a pin.
Instead of a trade, a decoy uses a piece sacrifice to lure a piece to a square.