Okay kiddo, so some kids have a little trouble with understanding and using words. They might say something that doesn't make sense or have a hard time figuring out what someone else is trying to say. That's where semantic pragmatic disorder comes in.
The "semantic" part means that they have trouble understanding the meaning of words and sentences. They might hear a sentence like "Get your shoes and coat on so we can go outside" and not understand that it means it's time to go outside.
The "pragmatic" part means they have trouble using words and sentences to communicate with others. They might have a hard time starting a conversation or keeping it going. They might not use the right tone of voice or facial expressions to show how they're feeling.
So basically, kids with semantic pragmatic disorder have trouble both understanding and using language to communicate. But with some extra help and practice, they can learn to understand and use language better!