title: What's the use of <meta name="viewport" content="width=device-width">?
body: <p>It's already asked question but I have still doubt. I made a web page using html, css and java script. When I used <code>&lt;meta name="viewport" content="width=device-width"&gt;</code> it's still same as when I was not used. So, my question is when is the correct time  to use <code>&lt;meta name="viewport" content="width=device-width"&gt;</code>.<br>
  And please guys don't fire on me. I really need help.</p>