It seems that some form of English is becoming or has become the international language.
it is a good way of communicating, transmitting messages and information. Its what we are doing now via language in a written form. Without it we may still be living in caves
Everyone uses language all the time. It's how humans communicate.
Because it's a contraction of "it is." For formal speech or writing, "It is" is more correct.
language is a medium to communicate and express/exchange information,views as social interact.