language is playing an incresingly important role in our daily life.for communication or for records,every country has its own language.in other words,language can be used to distinguish nationality and race.without language,history and culture can't be passed on smoothly,daily communication won't be easy,and most importantly,people won't be intimate emotonally with each other any more.and i believe that language can change people's way of thinking,for example,to persuade your enemy to surrender,and hypnosis is another good example.
i don't know language's category,and many countries have their own language.