Magical Journals are guiding books of Animal Guardians featured in the show American Dragon: Jake Long. They are used to write down their missions, experience, and knowledge of the Magical World.
The books are used by Animal Guardian to inform their charges of any information that might aid them. So forth the books contain an unmeasurable information on spells, magical creatures, history, and other dimensions. The books might also contain information on items that might endanger the Magical Community, such as the Aztec Skulls.
As part of the books' magic, the journal can create a hologram that shows a graphical form of the information. In a sense, those holograms enable one to see the past, the appearance of magical items and creatures as if it were a television.