Relation or Comparison Operator in javascript.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>example</title>
</head>
<body>
    <script>
        var a = 20;
        var b = 30
       var c = a==b;
       var d = a===b;
       document.write(c);
       document.write(d);
    </script>
</body>
</html>