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

Explanation

In the study of classification, similarities among organisms for various characteristics are looked for. First, the most basic characteristic of living organism is considered and almost all the organisms are placed under a basic group.
Then the next basic characteristic is considered for the next level of classification. Organisms with more similarities for that characteristic are grouped. This process continues leading to hierarchical levels of classification.
In the study of evolution, the more characteristics two species will have in common, the more closely they are related. And the more closely they are related, the more recently they will have had a common ancestor.
Hence, classification of species is in fact a reflection of their evolutionary relationship.