A smart contract is a special type of program that runs on blockchain technology. It allows the execution of contractual terms without the need for third-party intervention. Once the preset conditions are met on the blockchain, the smart contract will automatically execute the corresponding terms. For example, if a buyer confirms payment on the blockchain, the smart contract can automatically transfer ownership of the goods to the buyer. This process is completely transparent and tamper-proof.

Compared to traditional contracts, smart contracts have several key differences and advantages:

1. Automation: One of the biggest features of smart contracts is automatic execution, which reduces the need for manual processing and intermediaries. This means faster transactions, lower costs, and fewer human errors.
2. Transparency: Since smart contracts run on the blockchain, all transaction records are publicly accessible. This increases transparency and builds trust among all parties involved.
3. Immutability: Once the terms of a smart contract are confirmed by both parties and deployed on the blockchain, they cannot be altered. This enhances security and reliability while reducing the risk of breach.
4. Cost-effectiveness: Smart contracts reduce the need for intermediaries, such as lawyers or arbitrators, which can significantly lower transaction costs.
5. Accuracy: Smart contracts rely on coded algorithms and rules to execute terms, minimizing the risk of misinterpretation or errors that may arise in manual contract enforcement.

For example, consider a real estate rental agreement. Traditionally, both parties would need to sign legal documents, possibly with the assistance of third parties (such as lawyers or agents) to ensure the terms are correctly understood and followed. In contrast, with a smart contract, all terms can be encoded into the contract—such as rent payments, maintenance responsibilities, and lease duration. When the rent payment condition is met (i.e., the tenant transfers rent to the smart contract account), the contract automatically confirms receipt and may trigger additional actions, such as generating a payment receipt or updating the lease status. This makes the entire process more efficient, secure, and transparent.