In the context of cryptocurrency, RPC stands for Remote Procedure Call. It is a protocol that allows a program to request a service from a program located on another computer in a network, facilitating communication between different blockchain nodes.

RPC in web3 refers to the use of remote procedure calls to interact with decentralized applications (dApps) and blockchain networks through the web3.js library, enabling functions like reading blockchain data and sending transactions.

RPCs are used to enable communication between different systems or nodes in a network, allowing them to request and execute procedures or services from each other. In blockchain, they facilitate data retrieval and transaction submission.