The GAL system, or Global Address List, is a directory service used in email applications, particularly in Microsoft Outlook. It contains contact information for users within an organization, allowing employees to easily find and communicate with one another. The GAL is automatically updated, ensuring that users have access to the most current information. In addition to individual contacts, the GAL system may include distribution lists, which group multiple email addresses for efficient communication. This feature is especially useful for teams or departments, streamlining the process of sending messages to several recipients at once.