Survival skills are techniques a person may use in a dangerous situation (e.g. natural disasters) to save themselves or others (see also bushcraft). Generally speaking, these techniques are meant to provide the basic necessities for human life: water, food, shelter, habitat, and the need to think straight, to signal for help, to navigate safely, to avoid unpleasant interactions with animals and plants, and for first aid. In addition, survival skills are often basic ideas and abilities that ancient humans had to use for thousands of years, so these skills are partially a reenactment of history. Many of these skills are the ways to enjoy extended periods of time in remote places, or a way to thrive in nature. Some people use these skills to better appreciate nature and for recreation, not just survival.
Shelter
Airmen of the United States Air Force construct a survival shelter during Arctic Survival Training in Alaska.
Shelter is anything that protects a person from his/her environment, including dangerous cold and heat and allow restful sleep, another human need.
A shelter can range from a "natural shelter"; such as a cave or a fallen-down (cracked but not split) thickly-foliaged tree, to an intermediate form of man-made shelter such as a debris shelter, a ditch dug next to a tree log and covered with foliage, or a snow cave, to completely man-made structures such as a tarp, tent, or house.
Fire
Main article: Fire_making
Making fire is recognized in the sources as to significantly increase the ability to survive physically and mentally. Lighting a fire without a lighter or matches, such as by using natural flint and steel with tinder, is a frequent subject of both books on survival and in survival courses. There is an emphasis placed on practicing fire-making skills before venturing into the wilderness.
Fire is presented as a tool meeting many survival needs. The heat provided by a fire warms the body, dries wet clothes, disinfects water, and cooks