Imagine you are playing a game where you are scared of monsters, but you really want to get over your fear. Immersion therapy is like playing that game, but instead of using a video game, you use the real world.
For example, let's say you are scared of spiders. In immersion therapy, you might go to a room where there are lots of spiders around you. At first, you might feel very scared and want to run away. But, if you stay in the room and look at the spiders, you can start to realize that they are not actually going to hurt you.
As you get more used to the spiders, you can do things like hold a spider or let it crawl on you. This might still be scary at first, but over time, you will learn that spiders are not so bad after all.
Overall, immersion therapy is a way to help people get over their fears by slowly and safely exposing them to things that scare them.