A sign language (also signed language or just signing) may be a language which uses manual communication and visual communication to convey meaning, as against acoustically conveyed sound patterns. this will involve simultaneously combining hand shapes, orientation and movement of the hands, arms or body, and facial expressions to fluidly express a speaker's thoughts. They share many similarities with spoken languages (sometimes called "oral languages", which depend totally on sound), which is why linguists consider both to be natural languages, but there also are some significant differences between signed and spoken languages. Wherever communities of deaf people exist, sign languages develop. Signing is additionally done by persons who can hear, but cannot physically speak. an equivalent linguistic properties and use an equivalent language faculty as do spoken languages.