Extremum estimator

Okay, so let's say you have a bunch of numbers and you want to find the smallest one or the biggest one. That's called an extremum. An extremum estimator is just a fancy way of saying something that helps you find the smallest or the biggest number in a group.

Think about it like this - let's say you have a bunch of toys and you want to find the biggest toy. You could just look at them all and pick the one that looks the biggest, right? But what if you have so many toys that it's hard to tell which one is the biggest just by looking? That's where an extremum estimator comes in. It helps you figure out which toy is the biggest even if you can't tell just by looking.

So, an extremum estimator is just a tool that helps you find the biggest or the smallest of a group of things by using math instead of just looking at them. It's like having a super smart toy helper who can tell you which toy is the biggest or the smallest without you having to figure it out all by yourself!