"Template" for Containers?

Can someone please explain to me what’s the use of the dropdown “Template” on the bar that opens when “Edit Containerdesign” is clicked on top of a container?
Where can options for that dropdown be defined?

There is a core block which behind the scenes displays containers. You can declare alternate templates for that block as you would for any block.

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Wow, thank you so much for that information! Just checked, it’s called core_container. Cool!
The container automatically gets the class with the name of the template, prefixed with “ccm-block-custom-template-”
Thanks again!