OpenZeppelin Contracts is an open-source library designed for secure smart contract development, providing robust, community-vetted code for building decentralized systems. It includes standard implementations of ERC20 and ERC721 tokens and offers a flexible role-based permissioning scheme. The library is composed of reusable Solidity components, enabling developers to create custom contracts and intricate decentralized applications efficiently. To assist with development, tools like Contracts Wizard, an interactive smart contract generator, and OpenZeppelin Defender, a security platform for coding, auditing, deploying, and monitoring, are available. OpenZeppelin Contracts employs semantic versioning to ensure API and storage layout backward compatibility, complementing its extensive documentation and community support. The project emphasizes security through rigorous risk management, audits, and a bug bounty program, though its usage does not replace professional security audits. Available under the MIT License, OpenZeppelin Contracts encourages community contribution while maintaining a strong focus on reliability and security.