Okay kiddo, when people make decisions about something, they can have something called bias. Bias means they have reasons that make them more likely to make a certain decision.
But in Singapore law, bias is not allowed. This means that judges or decision-makers have to be completely fair when making their decisions, and they can't let their personal feelings or beliefs affect their decision-making.
If someone thinks the judge or decision-maker was biased, they can raise an objection called a "recusal motion." This means that they ask the judge to step aside and let someone else make the decision, because they don't think the judge can be fair.
Overall, the doctrine of bias is very important in Singapore law, because it helps ensure that everyone is treated fairly and equally.