Two examples of types are phrases and images. Phrase cards hold short lines of text. Images hold image files. Here are examples of each:
Phrase card
Image card:
Different types can have different edit views. When you edit an Image card, for example, you get an upload button. When you edit a Phrase card, you get a small box.
Like most things in Wagn, every type itself has a card. So there is a card named "Image" and a card named "Phrase". And like all cards, these cards have a type. Appropriately enough, their type is called "Cardtype".