The data bin is a tree of the data schema. From it you can drag & drop elements onto the template creating either an out tag(specific element) or a table (multiple elements). Very quick for a lot of the common uses requiring no setup.
Arguable the most powerful feature in the designer, you can select any content in a template, from a single character, to multiple pages including charts, bitmaps, tables, and more. Save this as a POD. Then in other templates drag & drop that POD and you get that same content.