MetaTrader 4, usually referred to as just MT4, is one of the most popular forex trading platforms for retail traders today. The trading platform was originally developed by Russian firm MetaQuotes Software in 2005. Despite its old age, the platform has remained popular among forex traders around the world to this day.
Part of the reason for MT4’s popularity is the very large marketplace for automated trading strategies – known as Expert Advisors – that is available within the platform. When the developers came out with a re-designed version of the platform called MT5 in 2010, adoption among traders was slow because the newer version did not support the large marketplace that already existed in MT4. To this day, many forex brokers continue to rely solely on the MT4 platform.