A repair kit is like a special box full of tools and things you can use to fix stuff when it breaks. Remember when you accidentally broke your toy and you thought you couldn't play with it anymore? Well, a repair kit can help fix it so you can play with it again!
Inside a repair kit, you might find things like glue, tape, scissors, screws, nuts, bolts, and maybe even some patches. When something is broken, you can use these things to put it back together. For example, if a toy car is missing a wheel, you can use a bolt and nut to attach a new one. If your shirt has a hole in it, you can put a patch over it to make it look like new again.
Remember, it's important to be careful when using the tools in a repair kit. Always ask a grown-up for help if you're not sure what to do.