The positivity effect is the idea that, when we get older, our brains start to focus more on happy and positive things, and less on bad and negative things. This means that, when you think back on the past, you will remember more of the good times and feel less sad about the bad times. It also means that when you look to the future, you will be more hopeful and excited about the good things that are ahead. When you focus on the positive, it can make you feel better and help you be more successful.