Your Drupal website is done, it looks the way you want it to, and it has all of the functionality required, right? Wrong! Often, people finish what looks like a complete Drupal site without giving a second thought to security. However, security is a major factor in building a completely successful Drupal site.
A report from the Center for Strategic and International Studies (CSIS) estimates that cybercrime costs businesses some $400 billion a year worldwide. It's always better to be on the proactive side of web security than on the reactive side.