What do you mean by classification and why do you classify things?

Classification means grouping objects according to similar traits. Classification is done in order to study common aspects of objects and to more easily handle large numbers of different things. For example, a zoo may have 1,000 animals, but 500 of them are pigeons, 200 are penguins, and 300 are various types of fish. Rather than listing the 28 different types of 'fish', they are all classified as 'fish'.