DOMContentLoaded why this in js code example

Example: domcontentload event in javascript

<!DOCTYPE html>
<html>

<head>
    <title>JS DOMContentLoaded Event</title>
    <script>
        document.addEventListener('DOMContentLoaded', () => {
            let btn = document.getElementById('btn');
            btn.addEventListener('click', () => {
                // handle the click event
                console.log('clicked');
            });
        });
    </script>
</head>

<body>
    <button id="btn">Click Me!</button>
</body>

</html>
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