Explain what references mean in programming and how they work.

In programming, a reference is a variable that stores the address of another variable in memory, rather than the value itself. Using references allows:

• Modifying data directly at the address, without copying.
• Passing large objects to functions without the overhead of copying.

For example, in Java (Android), references are used for objects. When you pass an object to a method, a reference to it is passed, not a copy.

Example in Java:

public void updateName(Person p) {
    p.name = "New Name"; // modify the object via reference
}

Person person = new Person();
person.name = "Old Name";
updateName(person);
System.out.println(person.name); // Will print "New Name"

Here, p is a reference to the person object. Changes inside the method affect the original object.

Thus, references enable efficient data handling, avoiding unnecessary copies and providing access to the same objects from different parts of the program.