This short article mentions about AFC system, I think it's close to our lives.
Now we have machines collect our fares, but sometimes it's annoy to keep 2 or 3 cards in hand since there are different systems. Especially, when traveling, it definitely will be more convenient to have just one card for all systems if they are unified. Is there any country doing this? Unify different transportation system!
By the way, the article also mentioned about NFC and RFID, any more concrete example for the two system?