Day 18 — What Is DeFi If There Is No Bank Behind It?

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What decentralized finance means

Decentralized finance, or DeFi, uses smart contracts to build financial tools on public blockchains.

Traditional finance depends on banks, brokers, and payment companies. Decentralized finance depends on wallets, tokens, contracts, and open networks.

The goal is not to remove every human. Instead, the goal is to make core rules more open and programmable.

A DeFi app may let users swap tokens, lend assets, borrow against collateral, or supply liquidity.

These actions happen through smart contracts. The contracts hold assets and follow predefined rules.

Because the rules are on-chain, users can often inspect how the system works.

In decentralized finance, a wallet is the user’s account.

The wallet signs actions and connects to applications. This gives users direct control.

However, direct control also means mistakes can be expensive.

DeFi has smart contract risk, market risk, oracle risk, liquidity risk, and user-error risk.

For example, approving a bad contract can put funds at risk.

Therefore, open access does not mean automatic safety.

Decentralized finance is finance built with blockchain-based rules.

It can be open and powerful, but it must be used carefully.