The Smart Machine EA V3.4.9 is an Expert Advisor (EA) designed for MetaTrader 4 (MT4) that automates trading strategies. However, the MQ4 file is the source code file for the EA, which is used for coding the EA in MetaTrader’s MQL4 language. MQ4 files allow you to make adjustments to the code and customize the EA if you have the necessary programming knowledge.