This is the parameter's key name — the label identifying which specific setting this Param row's Value field is holding. It carries the actual configured value behind a fabric capability — for example a VLAN-count ceiling tied to end-host mode — separately from the feature record itself. On this kind of record the name is typically something like 'max-vlans', so pairing it with the sibling Value attribute tells you which setting is at which number without needing a separate lookup table.