Spoken Language and Sign language are different as far as their grammar rules and sentences structure are concerned as well as the fact that sign language relies solely on facial gestures to express emotion where as spoken language relies on the tone of voice.  Spoken and signed languages clearly differ in terms of spoken language being vocal and sign language being visual; but they are more similar then you may realize.  Spoken and sign language both involve a great deal of body language to help the "speaker" relay their exact message.  It is argued that the study of sign languages can enhance our understanding of what language is.   Sign languages like spoken ones have structured sentences with grammatical rules.  Another similarity is the fact that each sign in sign language has a specific meaning as well as each word in a spoken language has its own specific meaning.  Sign language as well as spoken language culturally determined therefore both sign and spoken language vary from culture to culture.   Undeniably the most significant similarity between signed and spoken language is there purpose, both sign language and spoken are used as a source of communication.