Why is classification important in biology?
It allows efficient study of organisms.
If we were to classify organisms into groups based on their ancestry, characteristics, evolutionary traits, etc., we would have a much easier time studying them in detail. It's like sorting out your school assignments. You might want similar subjects grouped together, and so you can find everything much faster.
Same goes for biology. When there are millions of species of organisms, grouping them together can help study them a lot faster and easier.