Spaced repetition technique. Allows all knowledge to be stored in
long-term memory. At the same time spending less time on
memorizing. The clue point is that the information must be repeated
at certain increasing intervals. So you can learn a large amount of
new foreign words prepare for the exam and much more.
Spaced repetition-memory cards / What's New in vUnknown
The instruction is supplemented when adding cards from a
third-party service