Deaf people have different sign languages in each country. Just as English is different from Spanish, international sign languages vary in syntax, grammar, and concepts. We have Ethiopian sign languages, Brazilian Sign Language, Chinese Sign Language, Austrian Sign Language and British Sign Language, etc but I am going to mention few so that you can have a better idea of what they are.
AMERICAN SIGN LANGUAGE (ASL) uses signs, gestures, specific facial expressions, non-manual movements, and the like to express feelings, ideas, and concepts visually. It uses no voice, but does have facial grammar (non-manual markers, mouth morphemes). It uses a completely