# Working with data classes

### In this section

* [Assigning a data class](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/assigning-semantic-type)
* [Managing data classification](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/managing-data-classification)
* [Discovering semantic and data types](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/discovering-semantic-and-data-types)
* [Predefined standard and data-detected classes](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/predefined-standard-and-semantic-types)