Context data is made available to [devices](../dcim/device.md) and/or [virtual machines](../virtualization/virtualmachine.md) based on their relationships to other objects in NetBox. For example, context data can be associated only with devices assigned to a particular site, or only to virtual machines in a certain cluster.
Each configuration context may be assigned with any number of objects of the supported types. If no related objects are selected, it will be considered a "global" config context and apply to all devices and virtual machines.