1, KMS: It is a new product activation mechanism in products after Windows Vista.
2.MAK: Activation mechanism of batch activation key.
Second, the purpose is different.
1, KMS: The purpose is to make Microsoft better curb illegal software licensing (piracy).
2.MAK: The purpose is to serve Microsoft's big customers. Once the MAK key is activated, it will be decremented once until it is "0".
Third, the activation methods are different.
1, KMS: activated 180 days.
2.MAK: it can be activated multiple times.
Baidu encyclopedia -MAK
Baidu encyclopedia -KMS