What is the purpose of the document.getElementById() function in JavaScript | HTML | CSS

id: The value of the id attribute of the HTML element you want to select.
div id="myElement"This is a div element./div
script
// Retrieve the element with id "myElement"
// Change its text content
/script
/body
/html

In this example:
The HTML document contains a div element with the id attribute set to "myElement".
We then use the textContent property to change the text content of the selected element to "Updated content".