Okay kiddo, an Airport Express is a little box that helps you connect to the internet and play music through speakers. It is made by a company called Apple.
One of the cool things about the Airport Express is that it can create a Wi-Fi network, which means you can use your phone, tablet, or laptop to surf the internet or watch videos on YouTube even when you're not at home.
It can also help you play music through speakers. All you have to do is plug the speakers into the Airport Express and then connect the Airport Express to your Wi-Fi network. This allows you to use your phone, tablet or laptop to play music wirelessly without needing to plug anything in directly to your device.
So, the Airport Express is kind of like a really helpful helper that makes it easier for you to use the internet and listen to music anywhere you go.