A query protocol is a set of rules that governs the communication between users and blockchain nodes. It enables users to ask questions or request information from the blockchain, such as transaction details, account balances, or block information.These protocols define how queries are structured and what data can be retrieved. Different blockchains may have specific query protocols to accommodate their unique architecture and capabilities. For instance, some might allow users to query recent transactions, while others might enable complex searches related to smart contracts.Using a query protocol typically involves sending a request to a node, which then processes the request and returns the relevant information. This interaction ensures that users can access information without having to download the entire blockchain. Overall, query protocols enhance usability by facilitating efficient communication between users and blockchain networks, making it easier to retrieve important data.