Things pertaining to the people whose ancestors came from specific areas in India or Sri Lanka are referred to as Tamil. The primary language the Tamil people speak is also called Tamil.
These ethnically Dravidian people can also be called Tamils. Anything that comes from this part of the world, or is connected to this particular culture or ethnicity, can be described as Tamil. This includes Tamil food (like dosa or sambar), Tamil art and music, Tamil literature, and Tamil script, which is the alphabet used for writing in the Tamil language. Tamils make up about 25% of Sri Lanka's population, and about 7% of India's.