Yam (Mongolian: Өртөө, Örtöö, checkpoint) is a supply point route messenger system employed and extensively used and expanded by Genghis Khan and used by subsequent Great Khans and Khans. Relay stations were used to give food, shelter and spare horses for Mongol army messengers. Genghis Khan gave special attention to Yam because Mongol armies traveled very fast, so their messengers had to be even faster, covering 200–300 km per day. The system was used to speed up the process of information and intelligence.