Imagine you were a toy and you need a box to exist. Without the box, you wouldn't be able to stay together and take the form of a toy. The right to exist means that just like how you need a box to exist, everything in the world has the right to exist without being taken away or destroyed.
For example, animals, plants, oceans, and even people have the right to exist. This means that nobody should be able to harm them or take away their life or their home. It's like saying that it's not okay for someone to come and take your toy box away because you need it to exist as a toy.
The right to exist is important because everything in the world has a purpose and is connected to each other. Taking away one thing or destroying it could cause a chain reaction and affect everything else. It's like pulling one block out of a tower, causing the whole tower to collapse.
So, in short, the right to exist is the idea that everything in the world has the right to live and thrive without being hurt or destroyed.