MetaTrader – A popular forex trading platform from MetaQuotes. MT4 and MT5 include a Strategy Tester for backtesting and optimizing Expert Advisors (EAs). In this glossary, “MT5” references the newer version, but many concepts (like optimization criteria, genetic algorithms, agents) apply similarly to MT4’s tester. (Spotware’s cTrader is a different platform that uses cBots instead of EAs.)