The proprietary scripting languages for MetaTrader 4 and 5, respectively. MQL5 is an object-oriented, C++-like language for writing automated trading strategies and custom indicators. Through MQL, developers create “robots” that run in MetaTrader. These programs (Expert Advisors and indicators) can access chart data, execute trades (OrderSend(), OrderModify(), etc.), and handle events like new ticks or bars. Traders attach EAs/indicators to charts to automate strategies or analysis. Development is done in MetaEditor, and both developers and savvy traders use MQL to implement complex algorithmic logic on the MT platform.

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