An EA (Expert Advisor) is a program that runs inside the MetaTrader trading platform. You give it your trading rules — when to buy, when to sell, how much loss forces an exit — and it watches the market 24 hours a day, monitoring charts and placing orders on your behalf.
There is nothing mystical about it, and it is not "AI trading forex": an EA is a faithful executor. Whatever the rules say, it does — nothing more, nothing less.
An EA cannot guarantee profits. The strategy it executes may itself lose money — so the right order is: turn your idea into explicit rules, verify them with a backtest on historical data, watch it on a demo account, and only then consider a small live account. Stay far away from any EA that skips verification and promises returns.
Traditionally yes (the MQL5 language), which is exactly what keeps most traders out. TradingWithEA automates the whole chain — idea → rules → backtest → EA program: describe your strategy in one sentence, let the system do the rest, and the generated EA ships with an illustrated installation guide.