Do you know what a landfill is? It's like a big pile of garbage, where we throw away the things we don't want anymore.
The landfill directive is a set of rules and guidelines made by grown-ups to make sure that we don't harm the environment or make people sick when we throw things away.
These rules say that we can't just throw anything in the landfill. We have to separate our trash and recycle as much as possible. We also have to make sure that certain things, like chemicals or batteries, don't go in there because they can hurt people or the Earth.
The landfill has to be made in a certain way too. It needs to be lined with special materials to keep the bad stuff from getting into the ground and water. And it has to be monitored all the time to make sure it's not causing any problems.
So, basically, the landfill directive is like a list of rules to help us be responsible with our trash and protect nature and people around us.