The huge diversity found in the living beings and the vast number of organisms make their study very difficult. It is almost impossible to study each organism separately. Classification helps in the systematic study of the living beings. Therefore, the biological classification helps in revealing the relationship between various organisms. It also helps in making the  study of organisms easy and organized.

To classify a class of forty students, let us start the classification on the basis of sexes of the students. This classification will result in the formation of two major groups- boys and girls. Each of these two groups can be further classified on the basis of the name and surnames.

Since there is still some chance that more than one student can have the same surname, the final level of classification will be based on the roll numbers of each student.

The knowledge of characteristics of an individual or its entire population helps in the identification of similarities and dissimilarities among the individuals of the same kind or between different types of organisms. It helps to classify organisms in various categories depending upon these similarities and dissimilarities.