Drupal gives you a lot of tools to move things around and arrange the functionality of your site, but often the main difference between most websites comes down to presentation. Themes are the Drupal method for controlling your site’s presentation. In this lesson we'll discuss finding a theme, and installing and configuring themes. A big part of understanding how themes can change your layout lies in understanding blocks and regions, so we'll cover what those are, and why they're important. Then we'll talk briefly about administration themes and how they are different from your main theme.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.