Examples

Black can trade knight for bishop with 1...Nxd3. The queen has to recapture with 2.Qxd3, and is lured to d3, where it can be attacked with the skewer 2...Ba6. After the queen moves away, for example 3.Qc2, Black wins the exchange with 3...Bxf1.

This combination can sometimes happen against a battery, as in the following example:

White has a nice battery of rook, queen, and rook on the c-file. However, Black can now exchange rooks with 1...Rxc7. White has to recapture with 2.Qxc7, and the queen is lured to c7, where it can be attacked with the skewer 2...Rc8. The battery has lost coordination, there is no square that the queen can retreat to and keep the rook on c1 protected. After the queen moves, Black can capture White's now unprotected rook on c1. After 3.Qxa7 Rxc1+, Black has won the rook on c1 for the knight on a7, and is the exchange up.

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 skewer.
Instead of a trade, a decoy uses a piece sacrifice to lure a piece to a square.