Card
A flash card represents the content you want to learn. It has a question / language pair and a response / language pair. The reference to the language is fixed to an internal representation. This can be useful, if you want to manage your cards via queries later. A flash card also has a tag. I.e if you are obtaining words from a podcast or a book, you could write a certain tag in this field. Behind the scenes, the tool maintains statistics per user. Future releases of this tool might allow to share the cards, this is not implemented in this stage.