What is Wilderness Survival
The knowledge, the skill, and the will to keep yourself alive under any conditions, and often alone, until rescue is made either by the efforts of others or under your own power.
Understanding your environment, and the environment into which you will be entering in order to understanding the potential risks inherent in that environment. In a survival situation, you must always seek to reduce exposure to potential risk.
In other words -
It is always easier to prepare for and to avoid all possible problems than to react to them once problems develop.