Hi Ajit!

Before knowing about the combine term data hierarchy, You should understand the meaning of individual word i.e.

• Data- collection of information
• Hierarchy- tree like structure for example if you plot your generation starting from your grand parent generation, you will observe a hierarchy.

The combined term refers to organising data in the form of hierarchy. We have many types of data types like char, numerical, float, boolean, etc. Their arrangements in various form like field, character, rows , etc. is a part of data hierarchy.

Hope this will help you.