Hey kiddo! Have you ever noticed that some things can change their size when you interact with them? That's called "dynamic," which means it's able to move and change.
Like when you have a balloon and you blow it up, it gets bigger, right? That's a kind of dynamic sizing!
On a website, dynamic height means that the length or height of something on the screen can change depending on what you're doing. For example, a website might have a little box that opens up when you click on it. When you click on it, the box gets bigger so that you can see more information. Or, if you're typing into a box, it might get bigger as you type so that you can see everything you've typed so far.
Isn't that cool? Dynamic height can make websites more interactive and easier to use!