Okay kiddo, let me try and explain what a mixin is. You know how you like to mix different color paints together to make a new color that you like? That's kind of what a mixin is in computer programming.
A mixin is a small piece of code that can be added to different parts of a program to add some extra functionality. It's kind of like a tool that you can use to add new features to your program without having to write all the code from scratch.
Think of it like a recipe for a cake. If you have a basic cake recipe, adding a mixin of chocolate chips or sprinkles will make it into a new and different cake. Mixins work the same way by adding new functionality to your program.
So, when you're writing a program, you can add a mixin to one part of it to give it a new ability, and then add the same mixin to another part to give that part the same ability. It can save a lot of time and effort because you don't have to write the same code over and over again.
Hopefully, that helps you understand what a mixin is!