The objective of diagram is to present data in simple and interesting manner. It provides an impressive medium to present the data in attractive manner.

Its importance in statistical study becomes more obvious by below mentioned usages.

1. Attractive presentation: The presentation of statistical data by diagrams are so attractive that the characteristics of the data can be remembered for long time by the person who studies it.

2. Clear presentation: The data which is difficult to understand by its elaboration can be explained easily by diagrams.

3. Simple presentation: The complex data can be easily explained by diagrams.

4. Easy to compare: Two or more data can be compared easily by diagrams.

5. Helpful to children and illeterates: The presentation of data by diagrams are very useful for illeterates, less educated and children. The message of data can be understood without considering the1 figures of data. Diagram is a unique device to educate the children.

6. Useful for business and industries: The traders and manufacturers can advertise their products effectively with the use of attractive diagrams.

7. Useful in social sciences: The diagram becomes mendatory to focus some important aspects in the sciences like Psychology, Economics and Sociology.

8. Helpful in social reforms: The diagrams are more effective to create desired impression on the minds of people by different campaigns, to educate different classes of society for removal of social vices and implanting social reforms.

9. Concise presentation: Large volume of statistical data can be presented promptly and in concise form by diagrams.

10. Uniform interpretation: The data represented by diagrams can be easily understood irrespective of language barrier.