Okay kiddo, a self-loader is a special kind of machine that helps you do work faster and easier. Imagine if you had a toy car that you had to push with your hands to make it go. That would be really hard and take a lot of energy, right? But what if the toy car had a button you could press that would make it roll by itself? That would be a lot easier and faster, wouldn't it?
Well, a self-loader works kind of like that. It's a machine that helps people do work that involves moving heavy things, like logs or dirt. Instead of having to lift and move everything by themselves, people can use the self-loader to pick things up and move them around without as much effort.
Some self-loaders are big machines with arms that can reach up high or down low to pick things up. Others are like smaller versions of those machines that people can use with their own hands. But no matter what kind of self-loader it is, the idea is the same: to help people do work faster and easier.