unity adding component to another gameobject

//referencing a gameobject
public GameObject exampleObject;
//===============================================================>
private Rigidbody rb; //example of a component

public void Awake() {
	// adding a Rigidbody component to exampleObject
	rb = exampleObject.AddComponent<Rigidbody>();
  
	// referencing an existing Rigidbody component in exampleObject
	rb = exampleObject.GetComponent<Rigidbody>();
}