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What is the Key Management Service (KMS)?
Multiple Activation Key (MAK) activates systems on a one-time basis, using Microsoft hosted activation services. Key Management Service (KMS) allows organizations to activate systems within their own network. Either or both key types can be used by customers to activate systems in their organization: Volume activation provides two ways to complete volume activations. It’s not tied to license invoicing or billing. Volume activation applies only to systems covered under a Volume Licensing program and is used strictly as a tool for activation.
Tools to manage volume activation of Office. Volume activation is also used with other software from Microsoft, including Microsoft 365, sold under volume licensing agreements and that support volume activation. Volume activation is a configurable solution that helps automate and manage the product activation process on computers running Windows operating systems licensed under a volume licensing program.