The classification of living things is called taxonomy.
You can remember this if you think of a class of car (classification) called “taxi” (taxonomy).
The method of taxonomy widely used today has different ranks (seven of them) called:
Taxonomy ranks were developed by Swedish botanist Carl Linnaeus (pronounced LIN-EE-USS) in the 18th century.
Taxi ranks are basically car (Carl) lines for us (Linnaeus), to see where the taxis park.