Solidity is the language that programmers use to tell the blockchain what to do. It writes the rules of smart contracts, which are like agreements that are automatically enforced. Those instructions are understood and executed by Ethereum and other compatible blockchains. For example, it can be used to create a cryptocurrency, sell an NFT or manage an online vote without intermediaries.

Solidity It is a programming language contract-oriented, of static typing, with syntax inspired by JavaScript, C++ and Python, designed to write Smart Contracts that are executed on the Ethereum Virtual Machine (EVM). It was proposed by Gavin Wood and Christian Reitwiessner and has become the standard language for developing smart contracts on EVM-compatible blockchains, such as Ethereum, Polygon, Arbitrum, Optimism and BNB Chain.

Solidity allows you to declare functions, variables, events, structures, enumerations, modifiers, interfaces, inheritance and visibility, facilitating the development of complex and modular contracts. These contracts govern tokens (ERC-20, ERC-721, ERC-1155), DeFi protocols, DAOs, NFT marketplaces, Web3 games, governance and digital identity systems. The Solidity code is transpiled to bytecode and deployed on blockchain, where it runs deterministically and permanently.

In addition to business logic, Solidity includes blockchain-specific tools such as msg.sender, msg.value, Require, Revert, block.timestamp, and access to persistent storage (Storage, Memory, Calldata). It also supports external libraries such as OpenZeppelin, proxy update mechanisms, immutable contracts, role control and advanced functions such as Delegate Call, Selfdestruct or Fallback.

The language is actively maintained by the Ethereum Foundation and evolves with security, efficiency and functionality improvements (such as enums, immutable functions, custom types or Yul compilation). The Solidity domain is essential for creating secure, auditable decentralized applications adapted to the functional and legal requirements of the Web3 ecosystem.