Your options for Import type will change depending on which module you are in.

Admission's Office
Applicants:
Applicants:
Use this Import type whenever you need to create or update information specifically on the Applicant view of a record

Registrar's Office
Student:
Student:
Use this Import type when we need to either add a new student record which does not currently have an applicant record.
This can also be used for any general updates to existing student records

Enrollment:
Use this Import type when we enter information specific to the Enrollments tab of a student record
This can be helpful to update existing enrollments or adding a new enrollment for a previously withdrawn student

Relationship:
Use this Import type when adding new relationships for records or updating existing relationships.