In the United States, higher education is an optional stage of formal learning following secondary education. It is also referred to as post-secondary education, third-stage, third-level, or tertiary education. It covers stages 5 to 8 on the international ISCED 2011 scale. It is delivered at 3,931 Title IV degree-granting institutions, known as colleges or universities. These may be public or private universities, research universities, liberal arts colleges, community colleges, or for-profit colleges. U.S.
