what is document.ready in jquery code example

Example 1: jquery document ready

// jQuery document ready
$(document).ready(function() {
    
});

Example 2: document. ready

$( document ).ready(function() {
    console.log( "ready!" );
});

Example 3: jquery on window ready

// A $( document ).ready() block.
$( document ).ready(function() {
    console.log( "ready!" );
});