Imagine you have a piece of cake and you want to share it with your friend. The Bennett Acceptance Ratio is like a way to decide how you are going to cut the cake between yourselves.
Instead of just cutting the cake equally in half, like 50-50, you might want to decide it based on how big each person's mouth is, so that everyone gets an equal amount of cake based on their size.
The Bennett Acceptance Ratio is a similar idea, but it's used in science and math when people are trying to simulate and model complex systems. It helps them to decide how to change the parameters of a system to improve their simulations.
In this case, instead of a cake, they have a model or simulation of a system, and they want to change some parts of it (like how big or small a certain factor is). The Bennett Acceptance Ratio helps them to decide how much to change the factor based on how well the new model fits with the old model.
So, it's kind of like deciding how much cake each person gets based on comparing the size of their mouths, but instead, it's about deciding how much they change a simulation based on how well it works.