What is an NFC Tag and how does it work
NFC (Near Field Communication) is a wireless radio communications standard similar to WiFi or Bluetooth. But unlike the other wireless standards it only works at close range. NFC readers only work at a maximum range of around 5 inches (12 centimeters).
NFC is used to transfer information from one device to the other. You might use NFC to pass data from an NFC enabled smart phone to another NFC enabled smart phone, from a smart phone to a payment terminal or last from an NFC tag to a smart phone.
NFC Tag writer for Android.
One of the best Android NFC writers currently available in the market and itís free too. Enables to read, encode and write just about anything to your tags. Also possible to programs actions into the tags for triggering certain settings in your android phone when reading the tag.NFC Tools for Android