Wagn organizes information into lots of interconnected cards.  If you've used wikis before, you might be wondering, "Why don't you just call them pages?"  There are three main reasons:

1. To avoid confusing Wagn cards with web pages.  In Wagn, a given page may have dozens of cards on it  -- not so with most wikis.
   
2. To emphasize granularity.  Pages have lots of information, but Wagn scales down to much smaller levels.  It's not unusual to have a card whose only content is "yes" or "4", for example.  Feels weird to call that a "page."  It's more like a little index card.  In fact, Wagn is meant to encourage breaking information down into smaller bits.
   
3. Cards are intended to be shuffled and re-combined and connected in a rich variety of ways, much like a deck of playing cards.