JSON-RPC is a remote procedure call (RPC) protocol encoded in JSON (JavaScript Object Notation). It allows for communication between a client and a server over a network. JSON-RPC enables a client to invoke methods on a server and receive responses, similar to traditional RPC protocols but using JSON for data formatting.

As a user, you interact with the blockchain for two purposes -

1. To send a transction
2. To fetch some details from the blockchain (balances etc)

In both of these, the way to interact with the blockchain is using JSON-RPC

JSON RPC Spec - https://www.jsonrpc.org/specification

<aside> 💡 There are other ways to do RPC’s like GRPC, TRPC

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