Okay, so imagine you have a really big box with two cups of different liquids in it. Let's say one cup has water in it and the other cup has oil in it. Now, if you shake the box really hard, the liquids will mix together and look all messed up, right? But if you let the box sit still for a while, the two liquids will start to separate and the water will go to the bottom and the oil will go to the top. This is because water and oil don't like to mix together, they're like two friends who don't get along very well.
Now, imagine you have a bunch of really small boxes, all with two cups of liquids in them. And let's say each box has a little bit of water and oil mixed together, but they're not completely mixed up like in the big box. Instead, they're kind of hanging out in clumps together. This is called a non-random two-liquid model.
Scientists use this model to try to understand how different molecules in the liquids like to hang out together. They think that the molecules in water like to be near each other and the molecules in oil like to be near each other, and that's why they form these clumps. By studying this model, scientists can learn more about how different chemical interactions work, which can help them develop new medicines and materials to make our lives better.