What is Smart Contract?

A smart contract is a program stored on a blockchain that runs automatically when its conditions are met. It enforces rules without a trusted intermediary: tokens, swaps, staking, airdrop claims, and lending all run on smart contracts. Because the code is public and immutable once deployed, everyone can see and rely on how it behaves.

This matters because interacting with crypto usually means interacting with contracts. Understanding that a claim or swap is really a call to code helps you appreciate both the power and the risk involved.

Example: an airdrop claim is a smart contract that checks whether your address is eligible and, if so, sends you the tokens when you call it.

Safety note: smart contracts do exactly what they are coded to do, including malicious things if written by a scammer. A contract can be a honeypot that lets you buy but not sell, or can request a dangerous token approval. Favour audited contracts, read what you are signing, and never assume “it is on-chain, so it must be safe.” Related terms include token approval, honeypot, smart contract audit, and DeFi.