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You can use them to set your device up for location specific uses. For example, you might have one at work to change the setting on your phone to silent, so all those chirps and rings don’t disturb others.
Here are links to a few different articles that can give you more ideas for NFC uses. One I liked from the CNET article was using it to grant temporary WiFi access to your network without bothering with passwords. Hope you find some you like too: