A suitcase is like a big box with a handle and wheels that you can use to carry your things when you travel. Inside the suitcase, there is a lot of space where you can put all of your clothes, toys, and other things that you want to bring with you.
When you're ready to go on a trip, you can open up the suitcase and put in all the things you need. Then, you can close it up and use the handle and wheels to roll it around with you. This makes it easy for you to take your things from one place to another without having to carry them all by yourself.
Suitcases come in all kinds of colors and sizes, so you can choose one that's just right for you. And if you ever need to pack up and go somewhere, a suitcase is a great way to bring everything you need with you on your journey.