The xD-Picture Card is the latest memory card type. Technically, it is closely related to the SmartMedia Card (only FLASH chip on memory card/no controller).
However, the xD-Picture Card is considerably smaller and thus conforms to the trend of miniaturization of applications (20.0 x 25.0 x 1.7 mm).
It is mostly used by the two camera manufacturers Fuji and Olympus, where it replaces the SmartMedia Card.