In the Forex market, currencies are sold in lots. A Standard unit lot in Forex is equal to 100 000 units of the base currency. For a transaction to buy or sell currencies in the amount of 100 000 we choose = 1,00 lot, if 10 000 units then 0.1 lot, and if 1 000 units then 0.01 lot. Buying 3 lots EUR / USD, we open a long position of 300 000 euros. Selling 4 lots GBP / USD, we are opening a short position of 400 000 US dollars. The concept of a Forex lot is used exclusively in the Forex market, the banks buy and sell currency in any arbitrary amounts. We go into further detail in our article Lot, leverage and margin explained