The Exploration-Exploitation Dilemma
Imagine that after a crazy urge to gamble all your life savings you enter into a casino. You have in front of you a line of slot machines. To be capable of becoming a millionaire you should play the one that has the highest probability of winning, but obviously, you don’t know which one is the right one. So you need to try all of them an indefinite number of times to determine which one’s better. If you play too much in each slot you can end up wasting all your money in losing machines. If you decide to stay in one that seems the one after a few tries, but it isn’t, you’ll end up losing all your money to it.