Retreat (survivalism) is when people prepare for a bad situation by stockpiling supplies, like food and medicine, and building a safe place to go to in case of an emergency. People who do this are called survivalists, and they try to make sure they have enough supplies to last them and their families a long time, so they can be safe and comfortable. They also learn survival skills, like how to make shelter, find water, and hunt and fish, in case they ever need to use them.