In simplest terms, a forex spread is the difference between an ask price and bid price for a certain currency in terms of other currencies. Spreads are what allow profit form the forex market to be made in the first place. Generally speaking, only large financial intuitions are able to get the best kinds of spreads. The smaller the volume of cash that one could move, the less favorable the achievable spread is. Thus in the forex market, you really have to be able to move a lot of money in order to make a lot of money. There are resources on line that could help you find the best spreads and learn more about the forex market.