Okay, kiddo! Imagine you have a big jar of marbles. You love your marbles and you don't want anyone to take them away from you. One day, your friend comes over and they see your jar of marbles. They want to play with them too, but you don't want to share because you are afraid they might take some of your favorite marbles.
Now imagine that your friend comes up with an idea! They say, "I know you don't want to share your marbles, but what if we played a game where we both get to keep some of the marbles at the end?" You think about it, and it sounds like a good idea.
So you both decide to play a game of kalai. This is a special game that can be played with anything that can be divided, like marbles or candy. First, you each pick some marbles from the jar and put them into a pile. Then, you start taking turns. Each turn, one person can choose to either take a marble from the jar or take a marble from the pile.
The game continues until there are no more marbles left in the jar. At this point, you both count how many marbles you have in your pile. If one person has more marbles, they have to give some back to the other person until both piles are equal. This way, you both get to keep some marbles at the end, and you didn't have to worry about someone taking away your favorite ones!
So that's kalai, kiddo. It's a special game that helps people share things they both want without worrying about one person getting more than the other.