What is the purpose of the `push()` method in JavaScript?

The push() method in JavaScript is specifically designed to add one or more elements to the end of an array. This method modifies the original array and returns the new length of the array after the elements have been added.

Using push() is straightforward; for example, if you have an array called fruits containing ["apple", "banana"], invoking fruits.push("orange") would result in fruits becoming ["apple", "banana", "orange"]. This method is often used when dynamically building arrays or when you want to append elements without worrying about the current length of the array or shifting existing elements to make room.

The other choices describe different array methods or behaviors that do not apply to push(). For instance, adding elements to the beginning of an array would utilize the unshift() method instead. Removing the last element would involve the pop() method, while replacing an element at a specific index could be achieved by directly assigning a value to that index in the array.