This read-only object mirrors the `vid` property of a physical I/O expander module -- an add-on board that gives a blade or compute node extra mezzanine/PCIe ports inside Cisco UCS Manager's internal information model, exposed here as a text string for this I/O expander instance. The vid field reports the vendor-assigned identifier code stamped into this I/O expander instance's VPD, used alongside partNumber to uniquely pin down the exact FRU catalog entry. For the IOE plugged into slot 2 of a UCS X210c compute node this might read something like 'V02', a minor VPD revision code that support tooling matches against Cisco's parts database.