rsvp stands for in wedding cards

We’ve seen it our whole lives on birthday party invites (only from the fanciest kids at school, granted) and wedding invitations, but many of us don’t know what RSVP actually stands for. RSVP stands for ‘répondez s’il vous plaît’ and was borrowed from the French by well-to-do Brits in the 1800s because, let’s face it, ‘reply now ... harry potter playing cards