Basically, this module lets you control the <title> element. From the project page:
"The word "title" is a bit overloaded. Every piece of content in Drupal has a title, and so does every page. The page title is the one found in the HTML head inside the tag. It is also used on SERPs (Search Engine Result Pages) and can greatly enhance your websites SEO (Search Engine Optimization).
This module gives you granular control over