There are some key files like robots.txt
and .htaccess
which are often tweaked for Drupal websites. These can be considered part of the 'scaffolding' of a site - they control the way the site works, rather than its content or design. Any new release of Drupal core that includes changes to them specifically mentions that they need updating, as those changes may have to be merged with any customisations made on your site. For example, there was a security release that added rules to .htaccess
, which were essential for any site to incorporate and the template settings file, default.settings.php...