Devices are a key part of NetBox – after all NetBox is a tool for modeling network infrastructure. A device can be any piece of physical hardware installed within your network, such as a server, router, or switch, and may optionally be mounted within a rack. Within each device, resources such as network interfaces and console ports are modeled as discrete components, which may optionally be grouped into modules.
Device objects in NetBox have some dependencies that must already exist in NetBox before you can add the device. They are Manufacturer (the organization that produces the hardware) and Device Type. A device can be installed at a particular position within an equipment rack, or simply associated with a site (and optionally with a location within that site).