What is valid?

Valid means something is correct or works as it should, just like when you build a tower with blocks.

Imagine you're playing with building blocks. If you stack them carefully, your tower stands tall, that's valid. But if you put a big block on top of a tiny one and the tower falls over, that’s not valid anymore, it didn’t work as it should.

• Rules matter: When you play a game, there are rules. If everyone follows them, the game is valid.
• Examples help: Think about your favorite puzzle. If all the pieces fit together properly, the picture looks right, that’s valid too!
• Try it out: You can test if something is valid by using it or seeing if it works.

When you grow up, you’ll use "valid" in more places, like checking if a math problem is correct or making sure your password on a game works. But for now, just remember: valid means things work the way they should!