American Sign Language (ASL) is a complex visual-spatial language that is used by the Deaf community in the United States and most of Canada. It is not English, but a linguistically complete, natural language. It is the native language of many Deaf people, as well as some hearing children born into Deaf families. The language incorporates a vocabulary of words (hand signs) and finger spelling, as well as facial features such as eyebrow motion and lip-mouth movements which are significant in ASL as they form a crucial part of the grammatical system. In addition, ASL makes use of the space surrounding the signer to describe places and persons that are not present. 

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