A catalogue of life is like a big book that helps us keep track of all the different plants and animals in the world. Just like how we organize our toys, the scientists organize all the living things in the world into different groups and give them special names, just like we have our own names.
So, the catalogue of life is like a big library of these special names for all the living things in the world. This helps us easily find and identify different species and also helps us learn more about their habitats and environments. It's just like having a really organized and easy-to-read instruction manual for all the living things in our world.