Answer
A JMB is an XML-based information envelope that consists of two sections; manifest and payload. The manifest is the header of the JMB that carries information such as Problem Description, Synopsis, Priority, Severity, and Device Name.
Payload carries specific information such as logs, command outputs, and configuration file. Incident JMBs have different data elements in the payload depending on the problem type. Intelligence JMBs always have the same structure and data elements to ensure consistency and processing for proactive analysis. You can see JMB files on the Service Now GUI.
For more information about Service Now, see AI-Scripts Feature Guide.