Could someone.ecplain.to me.what this css.profile thing is ?
It is not required by all colleges, only a few hundred, I think. It is information about your income and assets that some colleges require in order to give your their institutional financial aid. They use the income and asset figures to calculate your aid by their own internal formula and may consider some of the information to decide how much they consider that you can pay. Whereas the FAFSA is used for Federal aid.
Since you are an international student you may have different forms to fill out instead. It will depend on the college.
And generally more time consuming and complicated to fill out than the FAFSA.