Illegal logging is when people cut down trees in areas where they are not supposed to, without getting permission from the government or the people who own the land.
It's like taking something from the store without paying for it, but instead of a toy or a candy bar, they take trees - which is not good because trees are important for our environment and for animals that live in the forest.
When people cut down trees illegally, they often leave behind a mess, like branches and leaves, and they can damage nearby plants and animals. This makes it harder for the forest to grow back and for the animals to find food, water, and shelter.
Illegal logging can also contribute to climate change, which is when the Earth's temperature gets warmer, because trees absorb carbon dioxide (a gas that can cause climate change) from the air.
So, it's important for people to follow the rules and only cut down trees in places where they are allowed to, so we can protect the environment, plants, animals, and our planet.