what does append do in javascript code example

Example 1: .append js

let parent = document.createElement("div")
parent.append("Some text")

console.log(parent.textContent) // "Some text"

Example 2: how to append in javascript

var list=[1, 2, 3, 4, 5];
list.push(6);
// .push allows you to add a value to the end of a list