Final answer:
In operations, objects communicate by passing messages, which involves sending a request to perform an operation from one object to another, often with necessary information.
Step-by-step explanation:
In operations, particularly in the context of object-oriented programming and software engineering, objects communicate with each other by passing messages. Message passing is a fundamental concept where an object sends a message to another object, requesting that a specific operation be carried out. These messages often include important information that the receiving object can use to perform a function, update its state, or return a result. This communication method is analogous to calling methods on objects in many programming languages, such as invoking a method on a class instance in Java or Python.