what does doctype html mean code example

Example 1: doctype html model

<!doctype html>
<html lang="fr">
<head>
  <meta charset="utf-8">
  <title>Titre de la page</title>
  <link rel="stylesheet" href="style.css">
  <script src="script.js"></script>
</head>
<body>
  ...
  <!-- Le reste du contenu -->
  ...
</body>
</html>

Example 2: doctype html

<!DOCTYPE html>
This tag shows that it is running HTML5

Example 3: doctype html

<!DOCTYPE html>
it lets the browser know about the version of HTML you
are using.but it is not nessesary 
since your browser will render it anyways

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