Ph.D. signifies 'Specialist of Philosophy' which is an abbreviated type of the Latin expression, (Ph)Philosophiae (d)doctor. The word 'theory' here implies its extraordinary Greek hugeness: Philo (partner or admirer of) Sophia (sagacity). Not in the least like most Masters courses (or all student programs), a Ph.D. is an unadulterated research degree. Regardless, that doesn't mean you'll basically experience three years verified away a library or research focus. Believe it or not, the bleeding edge Ph.D. is a different and changed capacity with a wide scope of fragments. 

While the second or third year of an empowering degree looks a significant sum like the first (with more modules and coursework at a more elevated level) a Ph.D. goes through a movement of stages. 

Finishing a composing review (a survey of the present award in your field). 

Driving extraordinary research and assembling your results. 

Conveying a hypothesis that presents your choices. 

Inspecting your suggestion and submitting it as a paper. 

Protecting your hypothesis in an oral viva voce test.