Define variation in relation to a species. Why is variation beneficial to the species?

(N/A) Variation refers to the differences in the characteristics or traits among individuals of the same species,which arise primarily due to inaccuracies in $DNA$ copying during sexual reproduction.
Variations are beneficial to a species because they provide a survival advantage. If environmental conditions change drastically,individuals with favorable variations are more likely to survive and reproduce,thereby ensuring the continuity of the species.