Cognitive biases are things that our brains do to make it easier to think or make decisions. They can sometimes lead us to make bad or wrong decisions because they take shortcuts that don't always make the best choices. For example, if we heard a lot of good things about a certain product, we might think it's the best even if there are better options out there. Or if we heard something bad about a person, we might think they're bad even if we don't know them. Cognitive biases are things our brain does without us thinking about it, and can make us think or act in ways that might not always be the best.