A loss limit stops play once your net losses over a set period reach an amount you choose. It differs from a deposit limit because it counts what you have actually lost after wins, rather than what you have put in.
Not every operator offers loss limits, and the exact rules vary, so check the safer gambling section of your account. Where offered, lowering a limit is usually immediate, while raising one comes with a delay.
A loss limit fits the idea that gambling money is spent, not invested: you decide the most you are prepared to lose, and the account holds you to it. Pairing it with reality checks and watching your net position during play keeps that figure in view. See our safer gambling page.