Custom deck of flashcards exported from Anki, a flashcard program designed to help users learn through spaced repetition; contains HTML data used for card presentation as well as text, images, and sounds.

APKG files store each side of a flashcard, called a "note," in a format similar to a database entry. Note entries are associated to a specific flashcard using an ID unique to the flashcard. Flash cards may have any number of notes linking to them. NOTE: You can import APKG files into Anki by selecting Main Menu → Import Cards.