# Cataloging data

### In this section

* [Working with data documentation](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/working-with-data-documentation)
* [Sampling and profiling data](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/sampling-and-profiling-data)
* [Discovering and managing relationships between objects](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/discovering-and-managing-relationships-between-metadata-elements)
* [Working with data classes](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/working-with-data-classes)
* [Contributing to the Catalog using social curation](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/contributing-to-catalog-using-social-curation)
* [Labelling objects](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/labelling-metadata-elements)
* [Providing comments on an object](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/providing-comments-on-metadata-elements)
* [Adding attachments on objects](https://help.qlik.com/talend/en-US/data-catalog-user-guide/8.0/adding-attachments-on-metadata-elements)