Why is classification used?

Scientific classification (Linnaeus classification) is used in order to group similar animal together. It is done by finding common ancestors, and moving in order of specifics up the classification. Kingdom, Phylum, (Subphylum,) Class, Order, Family, Genus, Species. For example, animals with a very recent common ancestor may be from the same genus, while animals with a more distant common ancestor would be only from the same phylum.