An information site is basically a site that represents yours business.  You do not sell products on this type of site.  Its main purpose is to give your site a professional representation.  These sites tend not to be very long, however you can add as much content as you would like.  The sites that add content prove to Google and the other search engines that you an authority on your subject matter.
Good examples of these sites are Professional businesses that have a web page such as lawyers, doctors, hospitals, accountants and bookkeepers, service businesses and the like.

These sites are approximately 5 to 10 pages and can be added to at any time.

  The advanced information sites are our regular info sites plus a content (articles) section.  By having these articles on your site you are telling Google that you give value to the internet community and that your page should rank better than your competitor.  Having the extra content also gives you more opportunity to rank for other keywords.  This gives you more opportunity to be found when someone does a search.