A catalogue is like a special book or a big list that helps you find things. Imagine you have a box of toys and you want to know exactly what toys you have. A catalogue would be like a list that tells you all the toys in your box, maybe with pictures and descriptions, so you can easily find your favorite toy when you want to play.
Think of a catalogue as a treasure map. Just like a map shows you where to find hidden treasure, a catalogue shows you where to find different things. It helps you know what you have and where it is, so you can get it quickly.
A catalogue can also be like a menu at a restaurant. When you go to eat, the menu shows you all the different foods you can choose from. A catalogue does the same thing, but with toys, books, clothes, or anything else you might want to see or buy.
Catalogues are like picture books for grown-ups. They have lots of pictures and words that help people decide what they want to get, just like how you pick your favorite bedtime story.