Sign language is the language that deaf and mute people use. Most often deaf people can use ASL. A lot of people think that to get someone who's deaf or mute to understand you, you just talk extremely slowly. This however is not the case. There are multiple different versions of sign language, there's ASL, BSL and many more. Not only death and blind people can learn it. If you have the patience, you can learn ASL, BSL or more by yourself