The Graph is a decentralised protocol for indexing and querying data from blockchains, starting with Ethereum. It allows developers to build powerful DApps by efficiently accessing blockchain data through subgraphs, which are APIs that describe how to pull data from the blockchain and present it in a usable form. This protocol makes it easier to build and run DApps that can scale by organising data and making it easily accessible. The native token, GRT, is used to incentivise data providers and indexers to ensure the data remains reliable and up to date.