Introduction
In blockchain, the word token usually means a digital unit recorded on a blockchain. A token may represent money, a right to use a platform, a collectible, an identity credential, a certificate, a game item or a real-world asset.
Tokens can be divided into two broad groups: fungible tokens and non-fungible tokens. The main difference is simple. Fungible tokens are interchangeable. Non-fungible tokens are unique.
What Is a Fungible Token?
A fungible token is a token where one unit has the same value and function as another unit of the same type. For example, one US dollar can be exchanged for another US dollar. One unit of the same stablecoin can usually be exchanged for another unit of that stablecoin. The individual unit does not have a special identity that makes it different from another unit.
Fungible tokens are commonly used for cryptocurrencies, stablecoins, governance tokens, reward points, platform credits and payment units. They can often be divided into smaller units, just as one dollar can be divided into cents.
Every Unit Is Equal
One token of the same type can be swapped with another token of that type without changing the value.
Usually Divisible
Fungible tokens can normally be divided into smaller units, which makes them suitable for payments and trading.
What Is a Non-Fungible Token?
A non-fungible token, or NFT, is a token where each unit has a unique identity. One NFT is not automatically equal to another NFT, even if both belong to the same collection. The value may depend on rarity, metadata, history, utility, creator reputation, ownership record or the asset linked to the token.
NFTs are commonly used for digital art, collectibles, in-game items, event tickets, certificates, domain names, loyalty passes, memberships and proof of authenticity. In some cases, NFTs may also represent claims linked to real-world assets, but the legal rights must be clearly defined outside the blockchain.
Fungible Tokens vs Non-Fungible Tokens
The table below summarizes the most important differences between fungible tokens and NFTs.
| Feature | Fungible Tokens | Non-Fungible Tokens |
|---|---|---|
| Interchangeability | Interchangeable. One unit can be exchanged for another unit of the same type. | Not interchangeable. Each token is unique and may have a different value. |
| Uniformity | Each unit is identical in value and function. | Each token has its own identity, metadata or ownership record. |
| Divisibility | Usually divisible into smaller units. | Usually treated as one whole token, although fractional NFT ownership can be created through separate structures. |
| Common Standard | ERC-20 is a common standard for fungible tokens on Ethereum. | ERC-721 and ERC-1155 are common standards for NFTs and multi-token assets on Ethereum. |
| Examples | Stablecoins, exchange tokens, governance tokens, reward tokens. | Digital art, collectibles, game items, certificates, tickets, identity badges. |
| Main Use | Payments, trading, rewards, liquidity, governance and DeFi. | Proof of uniqueness, ownership, authenticity, access rights and digital collectibles. |
Common Token Standards
Token standards define how tokens behave so wallets, exchanges, marketplaces and applications can interact with them in a consistent way. On Ethereum, ERC-20, ERC-721 and ERC-1155 are among the best-known token standards.
ERC-20
Used for fungible tokens. It is common for cryptocurrencies, stablecoins, governance tokens and utility tokens.
ERC-721
Used for unique non-fungible tokens. It is common for one-of-one NFTs and many collectible projects.
ERC-1155
A multi-token standard that can support fungible, non-fungible and semi-fungible tokens in one contract.
Real Examples
The easiest way to understand the difference is to compare everyday examples with blockchain examples.
1. Money and Stablecoins
Money is fungible because one dollar has the same value as another dollar. Stablecoins are designed to behave similarly as digital payment or settlement units on blockchain networks.
2. Bitcoin and Many Crypto Tokens
One bitcoin can generally be exchanged with another bitcoin. Many exchange tokens and governance tokens are also fungible because each unit of the same token type is treated equally.
3. CryptoKitties
CryptoKitties was an early NFT collectible project where each digital cat had different traits. This made each token unique rather than identical.
4. Digital Art NFTs
An NFT can represent a record connected to a digital artwork. Two artworks from the same artist are not automatically equal because each has its own metadata, rarity and market demand.
5. Game Items
A game may use fungible tokens as in-game currency and NFTs as rare weapons, characters, skins or virtual land. ERC-1155 can support both types within one contract design.
6. Certificates and Badges
Academic certificates, professional badges and event attendance proofs can be represented as unique tokens or blockchain records to support verification.
Use Cases
Fungible tokens and NFTs serve different purposes. A well-designed blockchain application may use both.
Payments and Settlement
Fungible tokens can be used as payment units, settlement assets, stablecoins or reward points.
Governance and Voting Power
Fungible governance tokens may give holders voting power in decentralized applications, depending on the project rules.
Collectibles and Digital Ownership
NFTs can represent unique collectibles, digital art, music records, game assets, membership passes or access rights.
Identity and Credentials
NFT-style records can support unique identity credentials, certificates, licences, warranties or proof-of-attendance records.
Real-World Asset Tokenization
Fungible tokens may represent fractional investment units, while NFTs may represent unique assets such as a single title, item or certificate.
Risks and Misunderstandings
Tokens are useful, but beginners should avoid common misunderstandings. A token is only meaningful if the rights, value, issuer, metadata, security and legal framework behind it are reliable.
- An NFT does not automatically transfer copyright ownership.
- A token standard does not guarantee investment value.
- Smart contract bugs can cause loss of assets.
- Metadata may depend on external storage or servers.
- Liquidity can disappear even if a token is listed on a marketplace.
- Some tokens may be regulated as securities or financial products.
- Wallet mistakes and phishing attacks can cause permanent losses.
- Fake collections and impersonation scams are common in NFT markets.
Summary
Fungible tokens and non-fungible tokens are both important parts of the blockchain ecosystem, but they are used for different purposes.
- Fungible tokens are interchangeable, uniform and usually divisible. They are useful for payments, trading, rewards, stablecoins and governance.
- Non-fungible tokens are unique and usually indivisible. They are useful for digital art, collectibles, certificates, memberships, tickets, game items and proof of authenticity.
- ERC-20 is commonly used for fungible tokens, while ERC-721 is commonly used for NFTs.
- ERC-1155 can support fungible, non-fungible and semi-fungible tokens in one flexible standard.
- The real value of any token depends on utility, trust, legal rights, market demand, technical security and the quality of the project behind it.