How to use NFC with RFID tags/chips When I bought my Samsung Galaxy SIII, there was a big buzz about the new phones
on the market supporting NFC (Near-Field Communications). However, given that
Blutooth exchange of files and even the somewhat more powerful Wi-Fi Direct
protocols were already available to allow files to be exchange, it seems
to me that yet another technology (NFC), when used to transfer files,
doesn't add much to what was already available.

Hence, the true value of NFC should be its ability to read RFID (Radio-Frequency
Identification) tags. However, I have not been able to find any of these devices
anywhere, and I'm not sure if it's because these are less used abroad where I am
living or not. So, where can I find these devices?
NFC tags are one type of RFID tags. NFC is a protocol for RFID, which can be understand by more and more devices.
You can buy NFC tags on amazon or other websites.

What can I do with that tags?
You can trigger something when you touch your phone to that tag. For example a NFC tag in your car which turns on Bluetooth, mutes your phone and turns off the lock screen. Then you can put the tag anywhere in your car and when you touch it your phone will be in your "car-mode"
However this requires some apps to work. For example 'Trigger' (https://play.google.com/store/apps/details?id=com.jwsoft.nfcactionlauncher) or 'NFC Tasks' are great apps for this purpose.