Forex swap

In finance, a forex swap (or FX swap) is an over-the-counter short term interest rate derivative instrument. In emerging money markets, forex swaps are usually the first derivative instrument to be traded, ahead of forward rate agreements and before exotics.
Structure:
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.