Consider the following scenario

You noticed that no two cats at the pet store are exactly alike. Some have spotted for some have striped for some have fur with one solid color what term is used to describe your observation?
Variation
Selective pressure
Natural selection
Fitness...

Variation. Variation refers to the differences or diversity in characteristics among individuals within a population. In this scenario, the different coat patterns and colors of the cats at the pet store demonstrate variation among the individuals.

U sure

Yes, I am sure. In the context of biology and evolution, the term "variation" is used to describe differences in traits or characteristics among individuals within a population. In the scenario you described, the various coat patterns and colors of the cats at the pet store demonstrate variation among the individuals.