Web3

Web3 is a loose label for apps and services that use public blockchains for ownership, payments, and rules, usually alongside ordinary web infrastructure. Users hold their assets and identity through a wallet rather than through a login. Ethereum co-founder Gavin Wood popularized the term around 2014, and it still has no formal definition or governing body. In practice it covers token trading, lending, NFTs, DAOs, and on-chain games.

Mechanically, a web3 app is usually an ordinary website, often backed by its own servers for data and indexing, that talks to smart contracts on a chain. Instead of signing up with an email and password, you connect a wallet and sign messages or transactions with your private key. Contract state, such as balances and rules, is public and can be read on a block explorer, although the source code is only readable if the deployer verified it. Gas fees are generally charged for on-chain transactions and paid in the chain's native token, though some apps or sponsors can cover them for users.

This matters to anyone buying small tokens, because many of them trade on decentralized exchanges, which means using web3 tools directly. Some tokens are also listed on centralized exchanges, where the exchange holds custody and the experience is closer to a normal brokerage account. With self-custody there is no support desk and no chargeback, so a transfer to the wrong address is final. The same openness lets anyone deploy a token in minutes, which is why a lot of what you will see is low quality.

Decentralization is a spectrum, so check how much of it a project really has. Many apps still depend on a centralized front end, a hosted server, an upgradeable contract, or an admin key that can change rules or move funds. Read what a wallet prompt actually asks you to sign. A malicious token approval can let a contract withdraw your tokens later, so the danger continues after you sign. Revoking that approval before it is exploited may prevent a loss, but it cannot reverse transfers that already happened. Keeping a separate wallet with small balances for experiments limits the damage from a mistake, and the word web3 on a project says nothing about whether the product works or is safe.