Simple definition
A smart contract is a small program on a blockchain that automatically does what it says when set conditions are met.
How it works
- A developer writes rules, such as "if payment arrives, release the ticket".
- The program is placed on a blockchain, where others can see it.
- When the condition happens, it runs on its own and the result is recorded.
Everyday example
In real life
A vending machine works like this. You insert the right payment, press a button, and the machine hands over the item without a shop assistant.
Benefits and why this matters
Why this matters
Smart contracts power most Web3 apps. Knowing what one does helps you understand what you are approving when an app asks for permission.
- Fewer middlemen for simple agreements
- Rules are visible in advance
- Actions run automatically
Risks and limitations
Things to watch out for
- Watch out: A smart contract is not a legal contract by default
- Watch out: Bugs can be costly and hard to fix
- Watch out: Approving a harmful contract can give it access to your tokens
Your beginner action
Try this
Next time an app asks for permission to connect to your wallet, read what it says it will do before you approve. If you do not understand it, stop.