When people want to communicate ideas they use language. Language is a medium of exchange. Without language people are reduced to physical touching or hand signals and have to be physically present with each other to communicate. With language people can exchange ideas with others in different centuries through books and in faraway places through the internet, newspapers and telephones. Sharing ideas leads to increasingly complex social agreements, concepts, inventions and discoveries, raising the standard of living and the level of expertise for the whole society.