Final answer:
Confirmation bias is the tendency to focus on information that confirms existing beliefs. It occurs due to the brain's limited ability to process information. For example, if you think your professor isn't nice, you may notice instances of rude behavior while ignoring pleasant interactions.
Step-by-step explanation:
Confirmation bias is the tendency to focus on information that confirms existing beliefs. For example, if you think that your professor is not ve nice, you notice all of the instances of rude behavior exhibited by the professor while ignoring the countless pleasant interactions he is involved in on a daily basis. This bias occurs due to the brain's limited ability to process information, leading us to select examples that confirm our beliefs rather than challenge them.