Un Smart Contract It's like a digital machine that automatically executes rules. You tell him what has to happen (for example: “if you pay me, I'll send you the product”) and he fulfills the contract without anyone having to intervene. It's on the blockchain, so it can't be modified and everyone can see how it works.

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Un Smart Contract (smart contract) is a self-executing computer program deployed on a blockchain, designed for automate agreements and operations between parties without the need for intermediaries. Its logic is defined in code and is executed in a way deterministic, transparent, immutable and verifiable by all network nodes, ensuring that exactly what is programmed is carried out under pre-established conditions.

By residing on the blockchain, the smart contract:

• If Deploy publicly through a transaction.
• If Run automatically when the established conditions are met.
• It cannot be modified once in production (unless it has upgrade logic).
• Manage digital assets, such as tokens, NFTs, or decentralized identities.

Its architecture is based on specific languages such as Solidity (EVM), Rust (Solana, NEAR) or Move (Aptos, Sui). It is integrated through public functions (mint (), transfer (), vote (), etc.) that interact with users or with other contracts.

Smart contracts allow you to build DApps (decentralized applications) such as DeFi protocols, DAOs, NFT marketplaces, voting systems, digital identities, asset tokenization and much more. They are the core component of Web3, by enabling programmed trust between parties that do not know each other, without relying on banks, notaries or centralized servers.

However, since they are immutable, errors in your code can have irreversible consequences, so its development must include auditing, unit testing, access control, error management and secure governance.

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