Why are variations beneficial in natural selection

Variations are beneficial in natural selection:Natural selection is the continuous process of nature to filter the population. So, due the variation of genetics it increases the probability of changing the characteristics of the individual that will either survive or diminish in the nature. Variation is the key to the evolution process. Variation provides the uniqueness to the individual that is not heridated from the parents. This unique character actually interacts with the environment and helps in the game of natural selection.