What we define 'Tibetan Dharma Language' or 'Classical Tibetan language' is a highly sophisticated, technical and specialised language used in Tibet particularly to formulate mostly Dharma related topics.
This language is extremely conservative and has remained virtually identical in the last thousand years or so. It is an indispensable tool for all those interested in Buddhism, Tibetan traditions, sciences and culture and its knowledge at all levels gives access to the marvels of that world, which is very difficult to translate to other languages with all its subtleties, imagery, technicalities and imaginative formulations.
Tibetan language has not only been used to preserve and transmit most of Indian Buddhist literature in translation, but it has been and still is also the expressive instrument of Tibetan Masters, yogins and scholars of great erudition and realisation of all times. Knowledge of Classical Tibetan language is particularly helpful for practitioners of Tibetan spiritual traditions, and is a priceless resource for students of medicine, arts and other sciences.

The Drajyor (སྒྲ་སྦྱོར་) is a system devised by Chögyal Namkhai Norbu to precisely represent the phonology of the Standard Tibetan Language, using the roman alphabet. Being very precise, this system is highly technical and rather complex. It is extremely useful for both students of Tibetan Language, as a support and reference to correct pronunciation, as well as for practitioners of the Dzogchen Community to correctly pronounce the tibetan texts of the practices.