In cryptocurrency, fungible refers to a type of digital asset that is interchangeable with other units of the same type, making each unit indistinguishable from the others. For example, cryptocurrencies like Bitcoin are fungible because one Bitcoin is equivalent to another Bitcoin in terms of value. On the other hand, non-fungible tokens (NFTs) are unique digital assets that cannot be exchanged on a like-for-like basis because each token has distinct characteristics or properties. NFTs are often used to represent ownership or proof of authenticity for digital artwork, collectibles, or other unique digital items.