why javascript add list to html code example

Example 1: add item to list javascript

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi"); // Fruits = ["Banana", "Orange", "Apple", "Mango", "Kiwi"];

Example 2: javascript add item to list

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.push("Kiwi");