Messages are classified in the following three categories:
Error: Indicates that an action cannot be completed because of a user or system error. These messages require immediate attention from an administrator.
Warning: Calls attention to an exception condition. These messages might not be an error but can cause problems if not resolved. These messages do not require immediate attention from an administrator.
Information: Provides feedback about something that happened in the product or system that is important and informative for an administrator.