> For the complete documentation index, see [llms.txt](https://tabbli.gitbook.io/tabbli/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tabbli.gitbook.io/tabbli/working-with-data/about-collections.md).

# About collections

Tabbli uses collections to organize a list of data records.

![An example of the collection](https://1035471547-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Llw2w6GBgkdQD53tRYI%2F-Lo08W1aQWM6ZIk14LTj%2F-Lo08pvYJLxRJcV_WHP_%2F%D0%97%D0%BD%D1%96%D0%BC%D0%BE%D0%BA%20%D0%B5%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%20%20%D0%BE%2014.20.03.png?alt=media\&token=9a0ace13-5981-43eb-9075-b7ec51bd1c4d)

A collection concept is similar to the table in relational databases but with some crucial differences. There are the next key features:

* You can collect data with the different structure inside the same collection.
* Filtering sub-system works for collections.
* Sub-collections are supported. So, you can create a few different collections when records from one of them can be linked with some records from another collection.

{% embed url="<https://www.youtube.com/watch?v=QzfVvx3Aeug&list=PLh0rZ0-uVht6uD-_iVv58GR45kDBXrgw3&index=4&t=0s>" %}