Graph Protocol is a decentralized indexing protocol that enables efficient querying of blockchain data. It allows developers to build and publish open APIs, called subgraphs, which can be queried using GraphQL.The primary function of the Graph Protocol is to facilitate the retrieval of information from various blockchain networks. By indexing data from smart contracts, it simplifies the process of accessing this information, making it easier for applications to interact with blockchain data.Users can create subgraphs tailored to specific needs, enabling customized data extraction and streamlined application development. This functionality supports a wide range of applications, from decentralized finance (DeFi) to non-fungible tokens (NFTs).Graph nodes, which index the data, operate in a decentralized manner, ensuring security and reliability. The protocol also has a native token, GRT, which is used for various activities, including indexing, query validation, and participating in governance.Overall, Graph Protocol plays a vital role in enhancing data accessibility and usability within blockchain ecosystems.