How do I use NearField Sensor?

Hello everyone !
Can anybody tell me how to use NearField sensor and what's the meaning and use of it ?

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Check here.

Always consult the documentation and search the forum or google before starting a topic.

Documentation here:
http://ai2.appinventor.mit.edu/reference/components/sensors.html#NearField

This game tutorial uses NearField and still might work https://appinventor.mit.edu/explore/ai2/cup-game

and more than you probably will every want to know from the community discussions. NFC has a 'gray' history with lots of issues.