Windows uses a tool called . When you enter a valid product key, slmgr contacts Microsoft’s activation servers. The server checks if the key is genuine and not already used on too many machines. If valid, the server sends back a confirmation, and your Windows becomes activated.

Pros:

Next, you must point your computer to a KMS server.

An activation menu will appear. Press the number corresponding to your desired activation (e.g., for HWID permanent activation). Method 2: Manual CMD Activation (KMS)