A Matter device can belong to several Fabrics at the same time (five by default), one Fabric per ecosystem (Apple, Google, Amazon, etc.), allowing a single user to control the device interchangeably from different apps.
True
A Fabric in Matter is the combination of a Certification Authority, an administrator and a Node ID namespace; each ecosystem (Apple Home, Google Home, Amazon Alexa, SmartThings) operates its own Fabric. The specification mandates support for at least five concurrent Fabrics on a device, and each Fabric carries its own credentials (distinct Node Operational Certificates and ACLs). The typical workflow is to commission the device first from an iPhone (joining the Apple Fabric) and then use the "Add to Google Home" share flow, which adds a second Fabric without removing the first, so the device responds to both apps.
Five concurrent Fabrics is a minimum, not a maximum: low-end Matter chipsets sometimes advertise a higher limit, but never assume more than five for a portable design that must work across all certified controllers.
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