This app supports NFC Data Exchange Format for WiFi Protected Setup (MIME Type: application/vnd.wfa.wsc).
Many NFC tag writers support tag creation according to that standard. And some WiFi routers and digital cameras also have built-in NFC tags of that standard.
This app can use for those NFC tags and devices.
You can set up WiFi connection very easily with NFC. Just tap to connect.
iPhone 7 and newer iPhones have NFC capabilities.