Okay kiddo, so you know how cows give milk that people drink, right? Well, some cows have a special kind of protein in their milk called A2 protein. This protein can be easier to digest for some people than regular milk with a different protein called A1 protein.
So, some farmers have started breeding cows that only have the A2 protein in their milk. They call this kind of milk A2 milk. People who have trouble with regular milk might try A2 milk to see if it's easier for them to digest. But it's still important to remember that milk is a good source of nutrition, so if you can drink regular milk without any problems, that's great too!