It is a sorting data into different levels respective to the sensitivity of that data.

It’s important in order to secure the data it must be categorized according to the sensitivity of the data – this will allow you to create granular controls to access that data and improve overall data security

Marking and storing after classifying the data must be marked accordingly so that it can be sorted and stored in the correct place. Marking the data also provides an easy way to search for specific types of data for future retrieval.