Currently their are 4 types of Members
Active Student: A an active Student in your organization.
Inactive Member: An inactive or Student in your organization.
Lead / Prospect: A prospect or potential new student who is not yet a student. Potential Students are the default type when using the Prospect/Lead Manager
Staff Member: A staff member is similar to an active student but can also be given access to certain admin areas as well as well as instruct a class.
You can change a member into a different member by changing the Member's Type.