Imagine you're playing with a big map. You're a treasure hunter, and you want to find all the treasure on the map. But sometimes the map doesn't have all the information you need to find the treasure. Maybe it doesn't show you where the secret tunnel is that leads to the treasure, or where the tricky traps are that you need to avoid.
That's where a "deep map" comes in. A deep map is like a super-secret, super-detailed map that has all the information you need to find the treasure. It shows you not only the main roads and landmarks, but also the hidden tunnels, secret rooms, and other hidden places on the map that you need to know about to find the treasure.
A deep map is like having X-ray vision for a map. It helps you see things you wouldn't normally be able to see on a regular map. So if you're a treasure hunter, or if you just like exploring maps, then a deep map is a really useful tool to have!