The U.S. education system is the most diversified and flexible in the world. Most private schools in the U.S. are controlled by independent organizations, whereas the authority of public schools is shared between local and state governments. A major difference between private and public schools is the cost. Usually private schools are more expensive than public ones because they must receive funding from outside of the government. All higher education institutions offer degrees, diplomas, and certificates depending on the status of the institution and the nature and length of the program.
Education standards and requirements vary considerably from state to state or district to district. In order to ensure that higher education meets the acceptable level of quality, institutions must receive regional or national accreditation through a private accrediting agency.