Expert Advisors are automated trading systems used in the financial markets, particularly in Forex trading. They operate on platforms like MetaTrader 4 or MetaTrader 5, allowing traders to automate their trading strategies based on predefined rules. These systems can analyze market conditions, execute trades, and manage risk without human intervention. Traders can customize Expert Advisors to suit their specific strategies, including setting parameters for entry and exit points, stop-loss levels, and trade sizes. This automation helps reduce emotional decision-making and can operate 24/7, taking advantage of market opportunities even when the trader is not actively monitoring the market.