Okay kiddo, do you know what metal is? It's a really strong material that looks shiny, like silver or gold. Metallic path facilities are made of metal cables or wires that are used to transmit information between two places.
Imagine you have a friend who lives far away and you want to talk to them on the phone. The phone company uses metallic path facilities to connect your phone to your friend's phone. The metal wires carry your voice from your phone to the phone company's building, and then to your friend's building, where it comes out of their phone and they can hear you.
Sometimes metallic path facilities are also used for internet. When you click on a website, your device sends a signal through the metal wires to the internet service provider (ISP) and then the ISP sends the website information back to your device through the same metallic path facility.
So, to sum it up, metallic path facilities are like metal roads that help information travel from one place to another, just like how you might use a regular road to get from your house to your friend's house.