The Vibe: Fungible = completely interchangeable (one unit exactly like another); Non-Fungible = unique and not interchangeable.
The Details: Fungible assets are identical—1 BTC equals any other 1 BTC, perfect for money or currency (most coins and tokens like ETH, USDC). Non-fungible means each item is one-of-a-kind with distinct properties (like different trading cards)—that’s what NFTs are: unique digital collectibles, art, or items on the blockchain.
Pro Tip: Check a token’s standard (e.g., ERC-20 = fungible, ERC-721/1155 = non-fungible) to know how it behaves. Fungible for payments, non-fungible for ownership of specifics.