What does a smart contract do?

A smart contract is a program recorded on a blockchain.

It holds state, receives calls and applies the same rules to every user.

It is neither intelligent nor inherently a legal contract: it simply executes its code.

Once deployed, the program has an address that wallets and applications can call.

Its code defines available functions, conditions and who retains privileges.

Some contracts are immutable; others can be upgraded by an administrator key.

Execution depends on neither opening hours nor an operator's goodwill.

Several applications can compose with the same public program.

Verifiable rules and movements reduce part of the need for trust.

The contract only knows on-chain data or information delivered by an oracle.

False data creates a false result even when the program works perfectly.

A flaw, hidden privilege or bad assumption can make automation dangerous.

Read — the interface prepares the call

Sign — the wallet presents and authorises the action

Execute — nodes compute the same result

Finalise — the new state joins the blockchain

Verify the official address and network.

Identify administrator rights and upgradeability.

Look for audits, past incidents and clearly documented limits.

Test with a small amount before granting a meaningful approval.

A smart contract makes execution predictable, not necessarily fair or safe.

Its value comes from understandable rules, reliable data and controlled privileges.

You can now look behind the button and see the program at work.