Broker
An intermediary that gives you market access. Compare KNF supervision, spread costs, execution quality and client-money protection, not account promos.
Definition
A broker is the intermediary through which you place orders and gain access to instruments (stocks, forex, CFDs, futures and so on). Brokers differ in supervision, client protection, costs (spread, commission, swap) and execution quality — not in how “nice” their interface looks.
Example
You want to trade EUR/USD and ETFs from the GPW. You compare an EU-licensed broker (its status in the KNF/ESMA registers), its typical EUR/USD spread, its commission on PLN-denominated stocks and its demo conditions — instead of choosing purely on the strength of a welcome bonus.
Anti-example / common mistake
A broker is not a guarantee of profit, and it is not “investment signals”. A common mistake: choosing on 1:500 leverage and zero commission alone, without checking supervision, the spread during news hours and the stop-out rules.