Sign language consists of visual hand gestures leveraged by the deaf community. Sign language is not a translation; it has its own grammar and sentence structure that differs from traditional languages.
Sign language, like traditional language, differs depending on region. In Canada, American Sign Language (ASL) is consistent with English-speaking Canadians, where the French equivalent is Langue des signes du Québec (LSQ), primarily used in the province of Quebec.
For many people sign language is their primary language.
Sign language in media
While most people assume captions are adequate for deaf audiences, those in the sign language community prefer to be communicated to in their primary language.
Consuming media is no different.
Media-created sign language is often accomplished with the primary program playing in a prominent position on-screen and a sign language interpreter in a smaller box positioned off to the side. Depending on the style of program that scenario can be reversed to put more focus on the interpreter