Displaying categories in tables

1. What is a category in a table?
2. Is a table a data category?

What is a category in a table?

Something is a category if it has an entry somewhere in categorylinks table. Categories might not have corresponding pages, so they need to be tracked separately.

Is a table a data category?

What are data categories? Data categories are tables of data, which are organized by rows and columns. Columns are also known as data fields.