The platform allows anyone to upload some of the photos they have on their mobile device and convert them into game cards they can trade with each other. Think of the baseball cards or dungeons and dragons or any other cards you might have played with and traded with your friends as a kid - but now anyone can create cards from their own media.
Users can buy cards from each other using in-game coins (money), by trading one or more cards for other card/s or by combination of coins and cards.
They can do that by posting bids (think eBay style bidding) or by negotiating directly with the card owner using a specialized chat interface (1 on 1 trading - think like haggling in the market or over craigslist with a seller “I’ll give you 3 Cards for that one card”. “No, my card is worth much more than that - give me 5 cards and $15 for it”).