Multiple realizability

Multiple realizability is like having a lot of different ways to make something. It's kind of like a recipe. A recipe is a way to make something, like a cake or a cookie. But there can be lots of different ways to make that same cake or cookie - some people might like to use nuts, and some people might like to use chocolate chips, and someone else might like to use raisins. All of those things are different, but they all can make the same cake or cookie. Multiple realizability is the same way. It means that something can be done in lots of different ways, but it still gets the same result.