Default RFID Realtime use in daily life


Recently i came across this new thing called RFID(probably not new for all the guys, but for me it is), i just want to know if there is any relation between NFC and RFID. I've a couple of videos of NFC in daily life usage on Youtube, but unable to know what this RFID is for. please let me know what is this and where in daily life this RFID chips can be used.