Most financial aid offers contain some combination of four types of aid, each of which works differently.
Grants and scholarships are money that does not need to be repaid. They reduce the gap between what college costs and what a family needs to cover from other sources. This is the most favorable type of aid in an offer, and it is the figure that most directly affects the borrowing commitment behind a college decision.
Work-study is a federal program that provides part-time employment opportunities for students who demonstrate financial need. Work-study appears in an offer as a dollar amount, but unlike grants, the money is not applied to the student's account automatically. It must be earned through work and then used toward expenses. A student who does not find or take a work-study position receives none of that aid.
Student loans are federal loans that the student borrows and is responsible for repaying after graduation, with interest. Their inclusion in a financial aid offer can make the total aid figure appear larger than it would otherwise be, but loans are not a reduction in cost. They shift cost forward in time and add interest on top of the original amount.
Parent loans, typically in the form of a Parent PLUS loan, work similarly to student loans but are borrowed in the parent's name. The parent, not the student, is legally responsible for repayment. Parent loans do not carry the same income-driven repayment options available for student loans.