Get started by downloading the official Drupal core files. These official releases come bundled with a variety of modules and themes to give you a good starting point to help build your site. Drupal core includes basic community features like blogging, forums, and contact forms, and can be easily extended by downloading other contributed modules and themes.
Following Drupal core development
These are stable, well-tested versions that are actively supported.
These releases have all the latest features, but might be not stable. Only use them if you are a developer and you are sure you know what you are doing.
Drupal 6 Releases
Drupal 6 will reach end of life on February 24th 2016 and will no longer be supported. If you are looking to start a new Drupal website, you should not download this version.