Copy trading means automatically replicating trades from one account onto one or more other accounts, in real time, without re-entering the order by hand each time.
The short version
You pick a leader account - the one whose trades you want to mirror. You connect one or more follower accounts. When the leader places, modifies, or closes a trade, the same action fires on every follower automatically, sized according to whatever ratio you set for that follower. That's the entire mechanic. Everything else (risk limits, broker support, the audit trail) is about doing that mechanic safely and reliably.
Who actually uses this
The most common case is a trader managing multiple prop firm accounts - an evaluation account plus one or more funded accounts, sometimes across different firms or different account sizes. Rather than manually re-entering every trade on every account, they designate one as the leader and let the rest follow at an appropriate size. It also shows up for traders who simply prefer to spread size across multiple broker connections for account-level risk isolation, without giving up the ability to trade all of them from one decision.
Before connecting a funded account as a follower, leave its Copy toggle off while you set the ratio and pairing, then turn it on and watch the first few trades land in the Event Log at minimum size. That confirms your ratio and account pairing are actually what you intended before you trust it unattended.
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