A PhD or Doctor of Philosophy is a postgraduate academic degree awarded by universities. Once one attains a PhD he or she may often be referred to as a doctor.
Education in the United States is mainly provided by the public sector, with control and funding coming from three levels: state, local, and federal, in that order. The common requirements to study at a higher education level in United States will include your admissions essay (also known as the statement of purpose or personal statement), transcript of records, recommendation/reference letters, language tests
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