Survival is the act of continuing to exist or of being alive.
A person can survive or he can succumb (fail or die) depending on his ability to get and hold the money, property or possessions he needs for survival.
The security of a good job, for example, means some certainty that you will survive well. The man who makes a good living can afford better clothing against the weather, a better home, medical care for himself and his family, good transportation and the respect of his friends. All these things help his survival.