Traders can choose either to buy or sell currency pairs when trading in the foreign exchange market. If you buy a pair, it means that they go a long way. And they're going short if they sell it. The same goes for long and short foreshadowing types. When traders buy a currency pair and leave their places open overnight, they use a long swap, as we discovered in this guide to what is a Forex swap. And they use a short swap when they sell the pair and leave the position overnight. The account can be credited or charged after each traded day based on the swap position the trader selects and the interest rates for the individual currencies.