The Arab Muslim Traders and the native Tamil converts to Islam in Tamilnadu state of India and Sri Lanka came into closer contact as a result of their commercial activities. They were bound by a common religion, but separated by two different languages. They felt the necessity for a link-language. They started to write Tamil in an adapted Arabic script called Arabu-Tamil. The Arabu-Tamil or Arwi script represents the Tamil language using an Arabic style of scripts. From eighth century to nineteenth century, this language enjoyed its popularity among Tamil speaking Muslims of Tamil Nadu and Sri Lanka. It rendered a most useful service for the advancement and progress of Arab and Tamil cultures.