There are many people who use sign language. # Deaf, hard of hearing and deafened people often use sign language in order to communicate with other people who share the same common language. If not, they can communicate through a person who knows the sign language and a majority language (e.g. English).
# Hearing parents are teaching their babies sign language because it enhances their communication skills and decreases their frustration, especially at a time when they do not have the capability to speak. # Non-verbal people who are hearing may use sign language to communicate, especially when they have conditions that make them non-verbal.