When you register to ProAbono, a business and a segment are created.
The Business contains your Billing Address info, your Tax Profile(s) (and rules), default language, the Features of your Site/Service/Application and some others parameters.
A segment is a subset of a Business with its own customers, offers and currency.
It is designed to sell offers into another market with different pricing, currency or sales workflow.
Segments help you to go further with your subscription business.