Lenglart inequality is basically a way of measuring how unequal something is. It is like a scale that shows how much more money or power someone has compared to someone else. For example, if one family has lots of money and another family has very little, the inequality between them will be high because one family has more money than the other. Another way to think about it is like a seesaw: when one side is much higher than the other, it means the inequality between them is high.