The Remote procedure calls refer to the calls made to the methods which are hosted by related web service.

A remote procedure call (RPC) is a protocol that allows a program to request a service from a program located on another computer in a network without having to understand network details. It essentially enables a program to execute a function or procedure on a remote system as if it were local, abstracting away the complexities of communication between distributed systems. RPC frameworks facilitate communication between different software systems, enabling them to work together seamlessly over a network.