Sanskrit (संस्कृतम्) is a historical Indo-Aryan language, the primary liturgical language of Hinduism and a literary and scholarly language in Buddhism and Jainism. The corpus of Sanskrit literature encompasses a rich tradition of poetry and drama as well as scientific, technical, philosophical and dharma texts. Sanskrit continues to be widely used as a ceremonial language in Hindu religious rituals and Buddhist practice in the forms of hymns and mantras. In the Republic of India Sanskrit is included in the 14 original languages of the Eighth Schedule to the Constitution. Classical Sanskrit distinguishes about 36 phonemes. The vowels of Classical Sanskrit written in Devanagari. Sanskrit was spoken in an oral society, and the oral tradition was maintained through the development of early classical Sanskrit literature. Writing was not introduced to India until after Sanskrit had evolved into the Prakrits; when it was written, the choice of writing system was influenced by the regional scripts of the scribes. Sanskrit has ten classes of verbs divided into in two broad groups: athematic and thematic.