This is the free-text description an administrator can attach to a server-pool qualifier criterion, explaining in plain language what that particular matching rule is meant to select for. It exists purely for documentation purposes inside UCS Manager's GUI/CLI, so its value has no effect on how the qualifier actually matches servers - it just helps whoever built the pool remember the rule's intent later. An admin might set this to 'Restricts pool to blades with 256GB or more memory' on a memory qualifier.