I was wondering how those licenses work.
When I have a view like:
User Licenses : Salesforce 30
Permission Set Licenses : Sales User 10, Service User 10, CRM User 10
I know that permission set licenses extends functionality of users when it is assigned to it, but when I'm creating a new User I do select "Salesforce" for User License, I don't have to assign a permission set in order to let him work with the platform.
My situation is that 30 Salesforce Licenses are used, but it seems that none of permission set licenses are used, so the sum of permission set licenses doesn't have to match with Salesforce User Licenses, right?
So, when are used this permission set licenses and for which purpose?