An investor who invests in the Forex market does not buy and sell the currency pair he trades at the same price, because it is not profitable. Therefore, it can be said that the spread is the difference between the purchase price and the selling price of a given currency. There is a buy and sell price in the market for each currency pair. There is no commission fees for Forex transactions. There is only an operating cost called "Spread". The transaction cost, which is the difference between the buyer's purchase and sale price.