Users can create an account by filling out your site registration form, or login and create an account using a third party provider like a social media account or your corporate directory service. Once they have an account they can track all of the services they have engaged with.
Who are my Users?
The platform organises users into groups. You can create as many different groups as you need to categorise your users.
Broadly speaking you'll have users who work in your organisations, generally referred to a staff users in this documentation, and people who are using your services.
You might create one main group for all of your staff users, then groups within your staff group for different teams and departments. People using your site, probably members of the public, will all be in one default group, but could also be added to other groups as they sign up for new services.