Smart Contracts

A smart contract is code that lives on a blockchain and runs the same way for everyone. Instead of asking a company to approve an action, users send a transaction and the contract follows the rules already written into it.

That makes smart contracts useful for marketplaces, lending apps, games, and governance systems. The big idea is not magic automation. It is shared automation: anyone can inspect the rules, and every node reaches the same result when the code executes.

The checks matter because contracts are strict. If you do not own the NFT, do not have enough tokens, or call the wrong function, the transaction fails. No support agent steps in to override the outcome.

The execution step can do many things: swap tokens, mint an item, release a loan, or update a vote count. What changes from app to app is the business logic. What stays the same is that the blockchain enforces it exactly.

This reliability is powerful, but it also raises the stakes. Bugs become public and expensive, which is why audits, testing, and simple designs matter so much in Web3.