QUOTE(Reynolds Riser @ Jul 18 2013, 03:27 PM)
The page title is another special place because the contents of the <title> tag usually gets displayed in most search engines, (including Google). While it is not mandatory per the HTML specification to write something in the <title> tag (i.e. you can leave it empty and the title bar of the browser will read “Untitled Document” or similar), for SEO purposes you may not want to leave the <title> tag empty; instead, you'd better write the the page title in it.
It is also called as Meta tags also it is require that title should be 60 - 65 characters long and description should be 160 character. It will help in promotion of website.