An extension is like when you have a toy train track, and you want to make it longer so your train can go further. You add more pieces to the track, and suddenly, your train can travel to new places! That’s what an extension does. It makes something longer or bigger so you can do more with it.
Think about your favorite book. If you love the story and want to know what happens next, you might get a new book that continues the tale. This new book is like an extension of the story. It adds more to what you already love, giving you more adventures to enjoy.
Imagine you have a drawing that you really like, but you want to add more colors and characters. You take another piece of paper and tape it to the first one. Now, you have more space to keep drawing. This new paper is an extension of your drawing. It gives you more room to create and explore your imagination.