Early Buddhist schools
The early Buddhist schools refers to the Indian Buddhist "doctrinal schools" or "schools of thought" (Sanskrit: vāda) which arose out of the early unified Buddhist monastic community (Saṅgha) due to various schisms in the history of Indian Buddhism. The various splits and divisions were caused by differences in interpretations of the monastic rule (Vinaya), doctrinal differences and also due to simple geographical separation as Buddhism spread throughout the Indian subcontinent.