On the internet, there are many things that everyone can see or read. It’s like an open window into everyone’s house where everyone else can look in.
What you show online can be seen by everyone, even strangers.
But some things are just for you, and should be nobody else’s business.
For example, you wouldn’t let a stranger look into your bathroom while you are taking a shower. You probably wouldn’t even let your mom in (except to get the toothpaste)!
Some things can be seen by your family and friends, who are people you trust. For example, you sometimes invite your best friend to look at some toys in your room.
This is called “privacy”. Only you can decide how much to show to your friends, family, and strangers.
When you are online, it’s the same rules.
Make sure that you look for the privacy settings on all the apps that you use, and apply them in the same way you would let people into your house. Strangers out, close the curtains!