Backpacking is like when you go on an adventure trip with a backpack. It's when you pack everything you need in a backpack and go on a trip, usually to different places all over the world. Backpackers usually travel on foot or by public transport to explore new places, meet new people, and experience new cultures.
It's like going on a very big adventure with only the things that you can fit in your backpack. You might be outside a lot and sleep in a tent or other places that are different than a normal hotel. You might eat different foods and learn new languages because it's important to be able to communicate with the people there.
Backpacking can be really fun and exciting because you get to see so many new things, but it can also be tiring because you have to carry everything you need on your back while walking or traveling. Nonetheless, it is a great way to learn and grow and have fun at the same time.