Okay kiddo, so you know how humans have different traits and characteristics like eye color, hair texture, and height? Well, some people believe that we should try to make sure that future babies have certain desirable traits by choosing only certain sperm and eggs to make a baby. This is called eugenics.
Now, some people think that we should only choose these desirable traits based on things like health and intelligence, and that it's okay to manipulate genetics to achieve these goals. This is called liberal eugenics.
Basically, some folks think that we should have more control over what traits are passed down from generation to generation, but some people don't think this is a good idea because it could lead to discrimination and hurt people's feelings. There are lots of different opinions on this topic, so it's okay if you don't quite understand it all.