What is a smart contract

A smart contract is a program on a blockchain that automatically executes the terms of an agreement when predefined conditions are met.

In simple terms, a smart contract is a digital agreement that runs by itself without intermediaries. It follows a basic rule: “if a condition is met, execute an action”.

Smart contracts are a fundamental part of blockchain systems and are widely used in DeFi, NFTs, and other crypto applications.

How a smart contract works

A smart contract is deployed on a blockchain and contains code that defines conditions and actions.

When the conditions are satisfied, the contract automatically executes the corresponding function.

For example:

sending funds after receiving a payment
executing a transaction when conditions are met
triggering functions when users interact with the contract

All actions are recorded on the blockchain and do not require a trusted third party.

Smart contract example

For example, a smart contract can automate a trade:

if user A sends cryptocurrency, the contract automatically transfers a token from user B.

Most tokens are created using smart contracts.

The contract defines:

total supply
transfer rules
minting and burning mechanisms

Once deployed, the token becomes usable across wallets, exchanges, and applications.

Where smart contracts are used

Smart contracts are used in:

decentralized finance (DeFi)
NFTs and digital assets
decentralized exchanges
DAO governance
asset tokenization

Advantages of smart contracts

automatic execution
no intermediaries
transparency and verifiability
high reliability

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