Because it gives some semblance of order to the numerous living organisms that are in nature. It gives biologists logical groupings to make organisms easier to study, and it provides scientific names that can be used by anyone in any culture/country/reigion of the world to decrease confusion. 
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We know that there are millions of organisms on this earth. So we can't just simply study them all. So the scientists classified them all in to special kingdoms, phylum, class, order, family , genus and species. Thus , it became really easy to find some organisms with special functions, similarities, differences in anatomy and morphology. It also brought in a new experience of study of organisms. All could easily got a clear picture about the organisms and their value.It also made us to realize the fact that, which all organisms are facing threat to their existence and also their