“Lot size refers to the volume of a trade. In forex, there are three main types: standard lot (100,000 units), mini lot (10,000 units), and micro lot (1,000 units). For example, if you trade 1 standard lot of EUR/USD and the price moves 10 pips, you make or lose $100. Choosing the right lot size depends on your account balance, risk tolerance, and strategy.”