Definition of "NFT"

NFTs can be used to represent ownership of a digital or physical asset; for example, CryptoKitties is an Ethereum game in which each digital collectible kitten is represented with a unique NFT token. NFTs can also be used to represent a piece of digital art, that is unique and non-fungible.

2019, Jitendra Chittoda, Mastering Blockchain Programming with Solidity, Packt Publishing Ltd, page 216

The Winklevii rode the cryptocurrency wave to the Bloomberg Billionaires Index and are bullish on NFTs. They ask why collecting digital art should be any different from collecting rare baseball cards.

2021 February 17, Mickey Rapkin, “‘Beeple Mania’: How Mike Winkelmann Makes Millions Selling Pixels”, in Esquire‎

“Everydays” was the first purely digital NFT sold by Christie’s, and it offered to accept payment in Ethereum, another first for the 255-year-old auction house.

2021 March 11, Scott Reyburn, “JPG File Sells for $69 Million, as ‘NFT Mania’ Gathers Pace”, in The New York Times‎

Typically, the art object that gets NFT’d is a digital file — maybe a JPEG image or an MP4 video — that lives on some hard drive, and that looks or sounds precisely the way it would have in the decades before NFTs came along.

2022 March 3, Blake Gopnik, “One Year After Beeple, the NFT Has Changed Artists. Has It Changed Art?”, in The New York Times‎