Expert Advisors can only be run on the platform / software MetaTrader trading and created using a programming language very similar to C + + to help make decisions in the trading and the weakness of human nature in forex trading transaction, for example: feeling tired, fearful, greedy, inconsistent, and others.
Expert Advisor is often called “robot” that can do some forex trading execution automatically and relatively faster than human because of this facility is suitable for traders who want the ease in trading. Trader does not have to monitor the movement of forex (foreign exchange) time by time, such as what is generally carried out if the trader has a floating loss. Expert Advisor can take over in order to open, close the order has been profit, cut loss, or money management. But should remember that you can not completely rely on the expert advisor without understanding how, basic, and forex trading mechanism itself.
The role of the trader is very important in forex trading using the robot, because the timing and the right setting in the use of expert advisors will determine the success trader.
Source : NewTrading.Net