Can you explain what it means to reference an object in programming?

In programming, a reference to an object is a variable that stores the address (pointer) to the location in memory where the object itself resides. Instead of copying the object, a reference allows working with the same instance, which saves memory and simplifies data management.

For example, in Java, when you create an object and assign it to a variable, this variable contains a reference to the object:

MyObject obj = new MyObject(); // obj is a reference to a MyObject object

If you assign this reference to another variable, both will point to the same object:

MyObject anotherRef = obj; // both variables refer to the same object

Changes made through one reference will be visible through the other, since the object is the same.