What is the difference between an interlibrary loan book and a book that comes from another Northwestern library (intercampus)?

Books from libraries OUTSIDE of Northwestern University are requested via interlibrary loan. If one of the Northwestern University libraries cannot provide you with a book you need, we can attempt to get a copy from another library in the United States. The library that is lending us the book will determine the due date for the book and whether or not the book can be renewed.