A quick overview of sign languages
Basic Background:
Sign languages are different from both spoken languages and from each other. There is no universal sign language. Because Deaf people can’t hear the spoken language of the country, a sign language like American Sign Language has a different grammar from spoken language. It is also different from other sign languages—even British Sign Language—because of the separate histories of American and British Deaf communities. Sign languages are also not spelled out words, although fingerspelling can be used if you want to translate a written words like the name of an unfamiliar town into sign language.