This is a Microsoft Windows Server 2025 Remote Desktop Services Client Access Licence pack, sold as a Lenovo-channel SKU, covering 50 users. An RDS CAL is a software licence, not hardware — it's required for each user (or device, depending on licensing mode) accessing a Windows Server's Remote Desktop Services role, which lets multiple users run full desktop sessions or individual published applications hosted centrally on a server. Businesses running terminal-server/RDS deployments — for example thin-client offices or remote/branch staff accessing centralised applications — need one of these licence packs sized to their actual concurrent user count to remain compliant with Microsoft's licensing terms.