Definition
EA (Expert Advisor)
Automated trading code on MetaTrader — allowed at many firms, but copy-EAs and exploit-EAs are banned nearly everywhere.
Personal automation is widely accepted; what's banned is third-party mass-market EAs (many accounts, same trades = copy trading at scale) and EAs built to exploit simulation quirks (latency/tick arbitrage, HFT bursts).
Firms may ask you to disclose or license an EA and can void profits generated by prohibited automation retroactively.
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Related terms
General industry definitions — individual firms define terms differently in their own ToS; the decoded rulebook for each firm is the source of truth. Educational, not financial advice.