What is SEO Templates?

A millions of blogs created with Blogger and hosted on Blogspot. Majority of these blogs use the standard templates provided by Blogger. And there are also many custom designed blog on Blogspot too.
These visually appealing designs and layouts may not be search engine friendly at all. The search engine robots may not be able to figure out what your blog is about and "crawl" beyond your main page.
And there is the duplicate content issue. Say, you configure a monthly archive and for the month of Feb 2007, you've got only one post. The Feb 2007 archive page will look very much like your item post. So you have two different URLs having identical contents and the search engine robots will flag duplicate content spam on your blog.(Source Here)