How are the areas of study - evolution and classification - interlinked?

(N/A) Classification involves grouping organisms into a formal system based on similarities in internal and external structures or evolutionary history.
Two species are more closely related if they have more characteristics in common. If two species are more closely related,it implies they share a more recent common ancestor.
For example,in a family,a brother and sister are closely related and share a recent common ancestor,i.e.,their parents. $A$ brother and his cousin are also related,but less closely than the brother and sister. This is because the brother and his cousin share a common ancestor,i.e.,their grandparents,in the second generation,whereas the parents were from the first generation.
With subsequent generations,genetic variations make organisms increasingly different from their ancestors.
This discussion clearly proves that we classify organisms according to their resemblance,which is essentially similar to creating an evolutionary tree.