This is wonderful app. It is a beginner Korean vocabulary which is a very good mobile learning app. In this app is included vocabulary, expressions and grammars. There's a lot of level learning to begin with. Categories are Word of the Day, Vocabulary, My Vocab Cards, Games etc. And in each category, there are sub categories. E.g in Vocabulary, there are 53 sub categories to learn and with levels like Interjection. It has 10 interjection to be learn which include definition, pronunciation, how to use it in a sentence and a lot more. After learning each sub categories l, there are quizzes to check what you have learned. It is a very good Korean vocabulary app.