What are the categories of data ?

1)      Structured data

                   This type of data is stored in relations in Relational Database Management system .

2)      Semi – Structured data

           This type of data is neighter raw data nor typed data in a conventional database system . a lot of data found on the web can be described as semi-structured data .this type of data does not have any standard formal Model . this data is stored using various format like XML and JSON

 

3)      Unstructured data

             This data do not have any pre-defined data Model . the data of Video, Audio, Images, Text ,Weblogs , System logs etc. comes under this category