Ontology (ONT) is a high-performance public blockchain and distributed collaboration platform that provides a modular framework for various use cases in an effort to eliminate trust issues and establish a bridge between the real world and the digital sector. It introduces the Ontology Identification Protocol, a Decentralised identity system, to facilitate secure interactions and interoperability across multiple blockchains and systems. Launched by a Chinese company, Onchain, in 2017, Ontology supports multi-chain scenarios and is structured into layers that include application, core protocols, and distributed ledgers. It offers robust Decentralised trust, data exchange, and identity verification mechanisms, ensuring privacy and security through its advanced consensus mechanism and proprietary smart contract system.