Sign language is often used by people who are deaf or hard of hearing, and it is a way for individuals to communicate through hand gestures and facial expressions. There are many different synonyms for the term "sign language," such as finger-spelling, non-verbal communication, manual language, and visual language. Gesture language, silent language, and hand language are also terms that can be used to describe sign language. American Sign Language (ASL) is the most common form of sign language used in North America, while British Sign Language (BSL) and Australian Sign Language (Auslan) are popular in other parts of the world. Regardless of which synonym is used, sign language is an important means of communication for many people.