Gesture languages are visual forms of communication used by people who are deaf or hard of hearing. There are various synonyms used for gesture languages, such as sign languages, hand languages, manual languages, and visual languages. Sign languages are used around the world, and each language has its unique cultural and linguistic features. Hand languages are used to convey information using hand movements and facial expressions. Manual languages involve using both hands to create signs and gestures. Visual languages are any form of communication that utilizes visual cues, such as facial expressions, gestures, and body language. Overall, gesture languages are essential for providing accessible modes of communication for the deaf and hard of hearing community.