There are a total of 49 countries that provides excellent research-oriented Ph.D. programs in the world. All 49 countries have their beauty, but the most popular, ancient, and renowned countries are, US, UK, Australia, Germany Canada, etc. But then again, which country is best for you. You can choose the best country from them according to your interest. Here the main aspects in terms of the Ph.D. program are discussed in the US, Australia, Germany, and the UK.