You remember from the coins and tokens lesson that money works because units are interchangeable — your euro and my euro are identical, and neither of us cares which one we hold. The technical word for that is fungible. An NFT — non-fungible token — is a token built on the opposite premise: every unit is unique, numbered, and distinguishable from every other. Token #4071 is not token #4072, the blockchain knows the difference, and that difference is the entire product.

Why would anyone want a token that isn't interchangeable? Because plenty of things in the world aren't: a concert ticket for seat 14B, a domain name, a game character, a signed first edition. Fungible tokens digitize money-like things; NFTs are an attempt to digitize ownership of specific things. Whether the attempt succeeds is a fair question — and we'll get to it honestly — but that's the idea.

What you actually own (read this part twice)

Here is the sentence that separates people who understand NFTs from people who paid tuition to learn it: an NFT is a record on a blockchain that points at something — it usually is not the something.

When you buy an NFT of an image, what you own is an entry in a smart contract saying your wallet holds token #4071, which references that image. Three uncomfortable details follow. The image itself usually lives on ordinary servers outside the blockchain — and if whoever pays for that hosting stops, your token can end up pointing at nothing. Owning the token almost never means owning the copyright; in most projects, the right to commercially exploit the artwork stays with its creator, and what you bought is closer to a certificate than to the art. And nothing stops anyone from copying the image — what can't be copied is the blockchain's record of which wallet holds the token. An NFT, at its core, is a provably scarce receipt. Sometimes a receipt is genuinely valuable. It's still a receipt.

The mania, handled honestly

In 2021, NFTs went from niche to front page: cartoon profile pictures selling for hundreds of thousands of dollars, celebrities everywhere, a single digital artwork auctioned for $69 million. If you came to crypto after that, you should know how it ended, because the data is unambiguous: trading volume collapsed, and the overwhelming majority of collections from that era are now worth little or nothing. The mania ran on classic bubble psychology — buying not because the thing was useful, but because someone would pay more next month — amplified by a market mood at maximum greed. When the mood turned, there was nothing underneath.

The honest summary isn't "NFTs are dead" or "NFTs are the future." It's narrower: NFTs as a get-rich scheme failed for almost everyone who tried it, while NFTs as a piece of infrastructure quietly kept existing. Tickets that can't be counterfeited and can pay the artist a cut on resale, in-game items that survive outside the game, domain names, membership passes, on-chain proof of provenance — these are real, unglamorous uses where "a unique token in your wallet" solves an actual problem. None of them require the token to cost a fortune. Most work better when it doesn't.

The safety angle — because NFTs have their own trap

NFT scams deserve a special mention because they exploit a mechanic regular crypto scams don't: approvals. Interacting with an NFT marketplace or mint means granting smart contracts permission to move tokens in your wallet — and a malicious site's "free mint" or "claim your reward" button can be a disguised approval that lets a drainer contract empty everything, not just the NFT in question. The defense is the library's oldest advice in new clothing: don't connect your main wallet to sites you can't verify, read what a transaction is actually asking to approve before signing, and treat free-and-urgent as the warning label it always is. Many people keep a separate wallet with small amounts just for this kind of experimentation — cheap insurance.

The takeaway

An NFT is a token where each unit is unique: a tamper-proof receipt pointing at a thing, which is not the same as the thing, its copyright, or its hosting. The 2021 mania proved receipts make terrible lottery tickets; the quieter uses — tickets, game items, provenance — are where the idea earns its keep. If you ever touch them, the approval mechanic is the part that can actually hurt you, so it's the part worth understanding first.