Web3 glossary with 50 terms explained: wallets, tokens, DeFi, NFTs, gas, bridges, L1/L2, validators. Simple, skimmable definitions for beginners.
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Address Public identifier where you receive assets on a blockchain.
Airdrop Free token/NFT distribution to certain wallets (e.g., for users or holders).
AMM (Automated Market Maker) Exchange model that prices trades using liquidity pools and formulas.
Approval Permission: A token gives a smart contract the ability to move your tokens.
Bridge Tool to move assets between different blockchains.
Burn: Permanently remove tokens from circulation.
CeFi Centralized crypto services (exchanges, lenders) that hold user funds.
Cold Wallet: Offline wallet (e.g., hardware). Best for long-term storage.
Consensus: How nodes agree on the next valid block (e.g., PoW, PoS).
Smart Contract Program that lives on a blockchain and runs exactly as coded.
Custodial: A third party controls your keys (you rely on that company).
dApp: Decentralized application that uses smart contracts.
DAO Online organization governed by token holders’ votes.
DeFi Decentralized finance: swaps, lending, yields via smart contracts.
DEX Decentralized exchange running on smart contracts (orderless/AMM).
DYOR “Do Your Own Research.” Verify facts before acting.
Explorer Website to view blocks, transactions, and addresses (TxIDs).
Fee (Gas) Network payment to process a transaction or run code.
Fork Change in chain rules (soft/hard); can create chain splits.
Fungible Token Interchangeable units (like standard coins or stablecoins).
Hot Wallet Internet-connected wallet (mobile/extension). Best for small amounts.
Hash: Fixed-length fingerprint of data; changes if the data changes.
ICO / Token Sale Fundraising by issuing a new token.
Impermanent Loss Value difference LPs experience vs simply holding assets.
KYC Identity checks are required by many services (“Know Your Customer”).
Layer 1 (L1) Base blockchain (main network) where transactions settle.
Layer 2 (L2) Scaling network built on top of L1 for faster/cheaper transactions.
Liquidity Pool Token reserves that enable automated trading on DEXs.
Mnemonic (Seed Phrase): 12/24 words that can recreate your private keys.
NFT Non-Fungible Token representing a unique digital item.
Node Computer that stores/validates blockchain data.
Nonce Number used once; helps order transactions and prevent replay.
On-chain Data/actions recorded directly on the blockchain. Oracle brings real-world data (prices, events) onto a blockchain.
P2P Peer-to-peer: users interact directly without intermediaries.
Phishing Fraud that tricks you into revealing keys or approvals.
Private Key Secret used to sign transactions. Keep it offline and safe.
Proof-of-Stake (PoS) Validators lock tokens and help secure the network.
Proof-of-Work (PoW) Miners do energy-intensive work to propose new blocks.
Public Key Derived from the private key; used to create addresses.
Slippage: Price movement between order placement and execution.
Stablecoin Token pegged to a reference (e.g., USD); designs vary.
Testnet Sandbox network for development and practice (fake funds).
TVL “Total Value Locked” in a DeFi protocol or across DeFi.
Tx / TxID Transaction / its unique identifier on an explorer.
Utility Token: A Token that grants access or features in an application.
Validator Node that proposes/attests blocks (esp. in PoS networks).
Wallet Software/hardware that manages your keys and addresses.
Whitelist (Allowlist): Pre-approved list for access, mints, or early features.
Wrapped Token Representation of one asset on another chain.
If you’re new to Web3, bookmark this glossary and return whenever a term feels unclear. Each definition is short by design, so you can scan fast; when you’re ready to go deeper, follow our beginner guides on wallets, blockchain basics, metaverse use cases, and NFT safety.
Remember that language in crypto evolves quickly; always check the context (which chain, which app, which jurisdiction) before acting on a buzzword.
Most importantly, practice safely: start with tiny amounts, double-check contract and wallet addresses, and keep your seed phrase offline.
With a grasp of keys, addresses, transactions, gas, and smart contracts, you’ll read dApp screens with confidence and avoid common pitfalls.
Over time, Web3 becomes less mysterious and more like any other tool—learnable, practical, and empowering.
- New to self-custody? Read Wallets 101 — Safely Storing Your Crypto.
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