The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
One of the Post Graduate academic degrees that are awarded by the Universities is the Doctor of Philosophy; abbreviated as PhD. Depending on the time periods for entry-level degrees and other factors, PhD programs vary from one country to another as well as from institution to the other. With the attainment of the degree, you earn the academic title of a Doctor. The courses are available to all students who meet minimum requirements worldwide.
The United States of America is a large country in North America, often referred to as the "USA", the "US", the "United States", "America", or simply "the States". American colleges are funded by "tuition" charged to the student, which is often quite expensive, very commonly reaching into the tens of thousands of dollars per year.
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