How do you use flashcards in your class?

I use flashcards all the time, can't imagine teaching a foreign language without them. Kids love it, it makes everything easier. I introduce new words/structures with flashcards, revise, play all sorts of games.
How do you use flashcards in your class? 

Flashcards (Please, watch the video)


Here’s more on flashcards and how to use them:

http://www.teachingenglish.org.uk/articles/using-flash-cards-young-learners

http://www.teachingenglish.org.uk/activities/using-flash-cards

There are free printable flashcards on LearnEnglish Kids. Click on the link below and then go to the ‘flashcards’ tab:http://learnenglishkids.britishcouncil.org/en/parents/learning-resources