The Sri Lankan Tamil dialects or Ceylon Tamil or commonly in Tamil language Eelam Tamil (Tamil: ஈழத் தமிழ், īḻat tamiḻ ?) are a group of Tamil dialects used in Sri Lanka by its native Tamil people and Moors that is distinct from the dialects of Tamil spoken in Tamil Nadu. Tamil dialects are differentiated by the phonological changes and sound shifts in their evolution from classical or Old Tamil (300 BC - 700 CE). It is broadly categorized into three sub groups: Jaffna Tamil, Batticaloa Tamil, and Negombo Tamil dialects. But there are number of sub dialects within these broad regional dialects as well. These dialects are also used by ethnic groups other than Tamils and Moors such as Sinhalese people, Portuguese Burghers and the indigenous Coastal Vedda people.