Meaning of various meta tags

Question

I want to know the what the following meta tags mean and do:

• <meta name="revised" content="Alpha, 9/18/2013" />
• <meta http-equiv="refresh" content="30" />
• <meta http-equiv="content-type" content="text/html;charset=UTF-8" />

Answer 1

<meta http-equiv="refresh" content="30" />  

Is used to make browser refresh the page after 30 seconds

<meta name="revised" content="Alpha, 9/18/2013" />

The revised meta tag records when the last update was done to the site

<meta http-equiv="content-type" content="text/html;charset=UTF-8" />

is used to define the character set for an HTML document