MetaQuotes Language is a specialized C++ based high-level object-oriented programming language. All trading applications for

MetaTrader 4 are written in MQL4.
MetaTrader 5 are written in MQL5.

The major difference of MQL from other programming languages is its trading specialization. An impressive set of built-in MQL functions for technical analysis and trade management, allows creating applications for automated market analysis and financial trading.