The Graph is a decentralized protocol that enables developers to index and query data from blockchains. It acts like a search engine for blockchain data, allowing users to easily access information without needing to understand complex coding or data structures. Using subgraphs, which are open APIs, developers can create and publish their own data queries. This makes it easier to build decentralized applications (dApps) that require real-time data from various blockchain networks, enhancing the overall functionality and user experience of these applications.