Okay, so imagine you and some of your friends are going on a long walk in the countryside in Ireland. You're going to be out there for a while, so you need somewhere to rest and maybe even sleep overnight.
That's where a bothy band comes in. It's basically a portable shelter that you can take with you and set up wherever you need it. It's made out of canvas or some other type of strong, waterproof material, so you'll stay dry if it rains.
Inside the bothy band, there's usually enough room for everyone to sit or lie down, and there might even be a small stove for cooking. It's kind of like a cozy little house that you can take with you wherever you go.
Bothy bands were really popular in Ireland and Scotland a long time ago, when people would use them for camping or for shelter during long walks through the countryside. Nowadays, people still use them for camping or hiking, or even for emergency shelters if they get lost or stuck outdoors.
So basically, a bothy band is a handy little shelter that you can take with you on your adventures to keep yourself dry and comfortable.