jQuery document ready function

Details

The ready() method is used to make a function available after the document is loaded. Whatever code you write inside the $(document ).ready() method will run once the page DOM is ready to execute JavaScript code.
and Syntax is

before use jQuery script we need to add a javascript file or URL "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"

$(document).ready(function(){
    /* Your Code */
});

Example

<script> $(document).ready(function(){ alert("Technical Blogs"); }); </script>