What is a Category shape for please?

I

Ian Digby

As a newbie on Visio, I am intrigued by the 'Category' shape to be found in
the Entity Relationship Shape area. It's description: "...one or more tables
are categories in another table." seems to be something useful - but I don't
understand it!!
Could anyone please take time to explain what this shape is for and how to
use it?

Many thanks for your kindness, Ian D
 
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