Answer:
International Sign Language (Gestuno) is a constructed sign language, which the World Congress of the World Federation of the Deaf originally discussed in 1951. In 1973, a committee created and standardized a system of international signs. They tried to choose the most understandable signs from diverse sign languages to make the language easy to learn. International Sign Language; known also previously as Gestuno is an international auxiliary language; which basically means its a "coded language" meant for people from different cultures, who speak different languages. In this case, it is a coded language for people who speak different manual languages. International Sign language is used for things like U.N. Council Meetings, international meetings such as the World of the Deaf, and Deafylimpics. The lexicon of ISL is very limited, and not as comprehensively exhaustive as ASL or other sign languages. ISL users will often tend to use regional signs, when there is no authoritative or standardized ISL replacement.
ASL is the broadest form of Sign Languages in the Americas, predominantly the U.S. and Canada. It has a complete structure with grammar and syntax... it is considered an official language (International sign Language does not have an accepted form of grammar and syntax... participants usually use the codified signs in their native grammar and syntax...) International Sign Language is not considered an "official language."