If you search for Section - you will see the data type in the reference docs - as you can see here. If you search for Container - you will see the docs for that as well.
However - most examples that have Tabs in Touch UI use Containers. See 2nd illustration.

See here for example of using Container in a TOcuh UI dialog -

To see this in an artilce and example AEM component - see:
Adobe Experience Manager Help | Creating an AEM 6.2 HTML Template Language tab movie component