What is an Object and Message ?

What is an Object and Message ?

In Object Oriented Design (OOD), a software systems consist of objects where each object has some state and behavior. Each object itself is responsible for carrying out tasks. Different objects in a system can communicate with each other to pass some information or request the services from one object. This communication and coordination among objects is achieved through message passing where one object requests the other object if it needs any services from that object. These messages may pass extra information via parameters to receiving objects.