Aid is a general term used to denote:
1. Help or something that helps, as in hearing aid or crunches;
2. Assistance as in financial aid to developing countries or financial aid to deserving poor kids
Aid refers to a gift of money to support a worthy person or cause or giving of help or assistance to other people or be of service to other human beings. Example is a Financial Aid
which refers to any type of financial assistance available to families and students for the purpose of funding higher education.