A bers slice is like a really fancy way of cutting up an apple. Let's say you have a big round apple and you want to share it with your friends. You could just cut it in half and give each friend a half, but that's kind of boring.
Instead, you decide to slice the apple in a special way called a bers slice. To do this, you start by cutting the apple into four equal parts, like you would if you were going to make a pie. But instead of stopping there, you keep cutting each of those four pieces into smaller pieces, like segments of an orange.
By the time you're done, your apple is cut up into lots of little pieces that are all the same size and shape. It looks really pretty and fancy, and each of your friends can take as many pieces as they want without feeling like they're taking too much.
A bers slice is just like that, but instead of an apple, it's a way of cutting up data into really small, uniform pieces. It's a way of organizing information so that it's easier to work with and understand. It might seem complicated, but just think of it like cutting up an apple into lots of little pieces that are all the same size and shape - it's just fancy cutting!