Windows Server 2019 Client Access Licenses (CALs) are essential for accessing the features and services of Windows Server 2019. CALs regulate user and device licenses so that companies can control how many users or devices are allowed to access the server resources. This is particularly important for managing network security and optimizing server utilization.

The User CAL allows individual users to access the server from multiple devices, which is ideal for employees who work from several locations. The Device CAL, on the other hand, is purchased for each device that will use the server, regardless of how many users access that device. This option is well suited for companies with multiple employees who share a device.

With the right CAL strategy, companies can efficiently manage their network infrastructure and ensure that only authorized users or devices access the Windows Server, which supports compliance with licensing policies.