If you want financial aid, you'll need to fill out the FAFSA. This FAQ will help explain what the FAFSA is all about.
The FAFSA is the Free Application for Federal Student Aid. Anyone who wants financial aid for college will need to fill out the FAFSA. The application is used to determine the dollar amount you or your family will be expected to contribute towards college. All federal grant and loan awards are determined by the FAFSA, and nearly all colleges use the FAFSA as the basis for their own financial aid awards.
The FAFSA is managed by the Office of Federal Student Aid, part of the Department of Higher Education. The Office of Federal Student Aid processes roughly 14 million financial aid applications a year and disburses about $80 billion in financial aid.

The FAFSA application should take about one hour to fill out, but this is only if you have all the necessary documents at hand before you begin. Some applicants get frustrated with the application process because they do not have ready access to all necessary tax forms and bank statements, so be sure to plan ahead before you sit down to complete your FAFSA.

The FAFSA requires information in five categories:

Information about the student
Information about the student’s dependency status
Information about the student’s parents
Information about the student’s finances
A list of the schools that should receive the results of the FAFSA
Students can fill out the FAFSA online at the FAFSA website, or they can apply through the mail with a paper form. The Office of Federal Student Aid strongly recommends the online application because it conducts immediate error checking, and it tends to speed up the application process by a few weeks. Students applying online can save their work and return to an application at a later date.
Again, any financial aid award begins with the FAFSA, so be sure to complete the form before the deadlines for the schools to which you’ve applied. Realize that most state deadlines are much earlier than the June 30th federal deadline.