The message fabric is a messaging infrastructure that connects the system components and allows them to communicate. Messages are transmitted to the components over the message fabric. The message fabric constitutes the message queues to write and retrieve application-specific data to and from the queues without the requirement for a private, dedicated connection to link the components. https://www.ibm.com/support/knowledgecenter/SSYJCD_1.0.0/com.ibm.help.meigV100.doc/com.ibm.help.meg.welcome.doc/meig_as4_messagefabricoverview.html