DigiCards

A DigiMemory (デジメモリ) is an item which resembles a Memory Stick that appears in Digimon Xros Wars. The data of "legendary Digimon" are stored on them and can be used with the Digimon Xros Loader to summon those Digimon. They depict an official Bandai image of a Digimon along with their name, the character for "Technique" written inside a green hexagon, and one of their Special Moves displayed at the bottom.

Digimon Xros Wars
While Shoutmon X2 fights against Ebidramon, Whamon informs the group of the existence of another "treasure" besides the Code Crown, the "memories of the legendary heroes", hoping that they will help them. After ChibiKamemon retrieves the case containing five DigiMemories, Taiki selects Leviamon's DigiMemory and uses its "Rostrum" attack by shouting out "Rostrum, Activate!" (ロストルム発動！), causing one of Ebidramon's pincers to be severed as a result.

Digimon Xros Loader
DigiMemory memory sticks, based on the ones that appear in Digimon Xros Wars, can be used to summon "legendary Digimon". They usually come included with models from either the Digimon Xros Figure Series, which is based on the Digimon of a particular figure, or the Digimon Xros Wars Digital Monster Series, which include DigiMemories that appear in series.