If you've ever sent out a letter of invitation for a wedding or a large party, you'll know how important it is for your guests to respond and let you know they're coming. The number of guests helps you to determine how much food you have to order, how many seats you need and what familiar faces to expect at the door.
But what does the term 'RSVP' actually mean? For years, many people have wrongly assumed it's an acronym for 'respond soon via post', when it couldn't be further off the mark. One TikTok account has answered the widely-unknown question and it's sending users into a frenzy online.
