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<html> <!--called root tag-->
<head> <!--contains meta information of page-->
<title><!--contains title of page-->
html with metatag;it is used to have page deescription,keyword,character set,author etc.
</title>
<meta charset="utf-8"><!--it is used for chracter set-->
<meta name="description" content="html examples"><!--it is for description of webpage-->
<meta name="keywords" content="HTML, C, c++, JavaScript"><!--it is used for keywords for search engines-->
<meta name="author" content="Krishna"><!--it is used for author name-->
<meta http-equiv="refresh" content="3"><!--it refreshes the page in every 3 seconds-->
<meta name="viewport" content="width=device-width, initial-scale=1.0"><!--for different devices of different width-->
</head>
<body>
we have used meta tag in our page as shown inside head tag.
</body>
</html>