Bootstrap aggregating (also known as bagging) is a way to make your predictions better. It works by taking a bunch of different predictions and combining them to make a more accurate prediction. So instead of just relying on one person's opinion, you can use lots of people's combined opinion to make an educated guess. It's kind of like if you asked a lot of your friends what they thought the right answer was, and then you averaged all of their answers to get a more accurate result.