Subgraphs are API layers based on The Graph Protocol that provide indexed blockchain data for high performance.
Blockchains store data in an unoptimized, linear fashion, making it inefficient for decentralized applications that require frequent access to specific information.
Custom subgraphs organize and index blockchain data, enabling quick and efficient queries for specific purposes, enhancing app performance.
Custom subgraphs also provide real-time data updates, allowing applications to access the latest information at high speed.