It is a alphanumeric characters string. Kaspersky activation code is unique for every kaspersky user.
An activation code is an array of 4 blocks of characters you need to activate the application. Each block consists of 5 characters which can be a combination ofletters and numbers, which comes to a total of 20 characters: ХХХХХ-ХХХХХ-ХХХХХ-ХХХХХ. An activation code is required for activation of the app.