Forex swap

In finance, a forex swap (or FX swap) is a simultaneous purchase and sale of identical amounts of one currency for another with two different value dates (normally spot to forward
A forex swap consists of two legs:
a spot foreign exchange transaction, and
a forward foreign exchange transaction.
These two legs are executed simultaneously for the same quantity, and therefore offset each other.
It is also common to trade forward-forward, where both transactions are for (different) forward dates