This small extension to the apache configuration is part of the standard Drupal distribution. It starts with a dot, so it's considered hidden in unix-based systems. It's not really important, is it?
Well, the truth is, it's one of the most important files.
Recently we discovered that a pretty high profile Drupal-based site, forgot to deploy that small file, which enabled everyone to list the /sites/ directory. You could even get to the /sites/default directory, where there was a "backup" file of the settings.php with the database settings!