WordPress 3 has introduced post types, so one could display on his pages different types of content separated from each other.
To take full advantage of this feature, along with the main type - Post - Dottoro Theme provides two further post types: Portfolio and News.
To help you display your tag and category pages separated for all three post types, tags and categories are also made post type dependent.
You can assign a different permalink structure to every post type, making the types which your contents belong to visible in the URLs of your website.
Some of the widgets also support post types; e.g. for the Recent Posts widget
you can set the desired post type, but you can also set it to post type independent mode.