Buy Limit is an order to buy a currency pair at a price that is lower than the current market price. It is used when a trader expects that the price of an asset will first fall to a certain level and then start to grow. This allows you to make a purchase at a lower price than the current price. For example, if EUR/USD is trading at 1.2000, you can set a at 1.1950 and if the price falls to this level, your buy order will be executed automatically. In this way, the "Buy Limit" helps you to catch a buying opportunity at a more favorable price, but of course, there are risks that the price will not fall to your level and the order will not be executed. It is important to take into account the current market and analyze it before placing such an order.