Okay kiddo, let me explain overhead lines in a simple way. You know how we use wires to carry electricity for different things like turning on lights, charging our phones, or powering our computers? Well, an overhead line is like a really big wire that carries A LOT of electricity from one place to another.
Instead of being hidden underground like some wires are, these overhead lines are up in the air! They look like long metal poles and wires stretching across the sky.
Sometimes you might see big trucks with cranes that are working on these lines. They might be fixing something or putting up new parts to make sure the electricity keeps flowing smoothly. It's important to be careful around these lines because they have a LOT of electricity in them, which can be dangerous if you touch them.
So, to sum it up, an overhead line is a big metal wire up in the sky that carries a lot of electricity from one place to another.