What's the purpose of meta tags in HTM code example

Example: html meta tags

<head lang="en">
  <meta http-equiv="content-language" content="en">
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="keywords" content="website, blog, foo, bar">
  <meta name="author" content="John Doe">
  <meta name="publisher" content="John Doe">
  <meta name="copyright" content="John Doe">
  <meta name="description" content="This short description describes my website.">
  <meta name="page-topic" content="Media">
  <meta name="page-type" content="Blogging">
  <meta name="audience" content="Everyone">
  <meta name="robots" content="index, follow">
  
  <title>My website title</title>
</head>

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