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Remote Procedure Call (RPC) nodes play a crucial role in blockchain technology by serving as intermediaries that allow external applications to interact with the blockchain network. An RPC node acts as a bridge between decentralized applications (dApps) or wallets and the blockchain, enabling them to perform tasks such as querying data, submitting transactions, and interacting with smart contracts. When a request is made, the RPC node processes it and returns the necessary information or executes the requested operation on the blockchain.

RPC nodes function by listening for requests from clients, which could be user interfaces, dApps, or other software requiring blockchain data or services. These requests are typically made using HTTP or WebSocket protocols. For instance, when a user wants to check their cryptocurrency balance or send a transaction, their wallet or dApp sends an RPC request to a node, which then retrieves the relevant data from the blockchain or broadcasts the transaction to the network for validation and inclusion in a block.

RPC nodes can be either full nodes or light nodes. Full nodes store a complete copy of the blockchain and validate all transactions and blocks, ensuring the integrity and security of the network. Light nodes, on the other hand, store only a subset of the blockchain and rely on full nodes for most of the data processing and validation. By using RPC nodes, developers can build applications that seamlessly interact with the blockchain without needing to run their own full nodes, thus simplifying the development process and improving accessibility. This functionality is essential for the scalability and usability of blockchain ecosystems, enabling a wide range of applications from simple wallets to complex decentralized finance (DeFi) platforms.