Drupal's Blocks System is the partner to your site's content. Of everyting you see on a Drupal page, it's either content or something from a block. With the introduction of Views, you can pretty much say most every Drupal page is Content (nodes) and Blocks or a View (which is content itself) with - again - blocks.
What may be confusing is the "Blocks" area of Drupal is actually the management of the available blocks within the defined Regions (Drupal 6 or Drupal 5) of the current Theme.




