ERC-721 gives each token an ID within its contract, making it possible to track a particular NFT's owner and transfers. The standard handles that onchain identity; it doesn't itself grant copyright, keep an image online forever or establish that a collection is official. Those questions need separate evidence.
IN THE WILD
Your wallet owns token #42 in a collection’s ERC-721 contract, while the artwork and any usage rights are described elsewhere.
People often say they're buying Ethereum when they mean buying ether. ETH is the asset; Ethereum is the network. ETH pays for transactions on Ethereum and can be committed to validatorstaking. Tokens created by smart contracts are separate assets, even when they live on the same chain.
IN THE WILD
Your wallet has a token balance but no ETH, so you still need ether to pay for its transfer on Ethereum.
A blockchain that runs programmable accounts and applications, with ether as its native asset.
Ethereum gives developers a shared place to run programs whose results other participants can verify. That's why a lending app, token or game can use the same network instead of building a new chain. The network is Ethereum; the asset used to pay its transaction fees is ether.
IN THE WILD
“Is this token on Ethereum?” asks which network its contract uses, rather than whether the token itself is ETH.
Data emitted during contract execution that applications can read from transaction records.
Event logs help explorers and apps follow what contracts report: transfers, deposits and other actions can produce structured events. They're useful for indexing activity without rereading every contract's storage. A familiar event name isn't proof of a legitimate project, though; a contract's behavior and the address emitting the event still matter.
IN THE WILD
An explorer uses a token contract’s Transfer events to build a list of transfers for your walletaddress.
The Ethereum Virtual Machine, which executes Ethereum contract bytecode according to shared rules.
The EVM is the execution environment behind Ethereumsmart contracts. Nodes use its rules to reproduce transaction results rather than just accepting what an app claims happened. Other networks can also support EVM contracts and familiar tools, but compatibility doesn't mean they share Ethereum's fees, assets or security assumptions.
IN THE WILD
A developer ports an EVM contract to another chain, then checks that chain’s configuration and dependencies before deploying it.
A public key plus derivation information that can generate eligible non-hardened descendant public keys.
An extended public key, often called an xpub, lets software derive public keys and monitor the corresponding addresses. It does not ordinarily provide spending authority on its own. Its reach makes it useful for accounting, but sharing it can reveal more wallet activity than sharing one receiving address.
IN THE WILD
Your accounting dashboard tracks addresses derived from your xpub without getting signing keys; it still sees more than one payment address.
An EOA is the account type people usually start with when creating an Ethereumwallet. Its key authorizes transactions and its nonce keeps them in order. Modern code-delegation mechanisms can add programmable behavior, so the old shortcut that every EOA must always have no code is no longer a complete description.
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A wallet’s key signs a transfer from your EOA; the receiving contract then follows its own code when that transaction calls it.
A service that distributes small amounts of test-network assets for development.
A developer still needs the test network's fee asset to try a deployment or transaction. A faucet helps supply that starting balance, sometimes with limits or access requirements. The assets belong to the testing environment, so receiving them does not create an equivalent balance on the production network.
IN THE WILD
"My testnetwallet is empty. I need a little test ETH from the faucet before I can deploy."
Bitcoinwallets commonly quote fee rates in satoshis per virtual byte. The total fee depends on both that rate and the transaction's virtual size. A higher rate can make inclusion more attractive to miners, but the pending transaction set and block space still affect when confirmation occurs.
IN THE WILD
"Same fee rate, different total fee?" Your Bitcointransaction's virtual size also affects the satoshi amount it pays.
A configured trading-fee level used by a pool or exchange mechanism.
Some AMMs offer multiple pools for the same pair with different fee tiers. A lower percentage doesn't automatically produce the best trade: available liquidity and price impact also affect the quote. Fee designs differ across protocols and versions, so check the actual pool instead of assuming every AMM has the same menu of fixed tiers.
IN THE WILD
A router selects a higher-fee pool because its deeper liquidity gives your particular swap a better overall output.
The daily pick rotates automatically. Our initial collection was published on October 9, 2026. New words join on their publication date. Every concept includes a reference.