Preppers are people who like to prepare for emergencies or disasters, just like how you pack your backpack for school. They like to make sure they have everything they need to be safe and comfortable in case something bad happens, like a big storm or something else that could make life difficult.
They might store extra food, water, and supplies in their homes, like flashlights or blankets. They might also learn skills, like how to start a fire or how to bandage a cut.
Preppers don't think that something bad will definitely happen, but they want to be ready just in case. It's like wearing a seatbelt in the car - you don't expect to crash, but it's good to be prepared for the worst.