Language is the normal way humans communicate. Looking at all animals, only humans use language, though many other animals communicate in different ways. An important difference is that human language has syntax, which is a set of rules for connecting words together to make statements and questions; some other animals use syntax, but it is not as complicated as human syntax. Language can also be changed, by adding new words, for example, to describe new things. This is very uncommon in other animals. 

Language may be done by speech or by writing or by moving the hands to make signs. It follows that language is not just any way of communicating. Even some human communication is not language. Humans also use language for thinking.

The capacity to learn and use language is inherited. Normally, all humans are born with this capability. Which language is learned by a child depends on which language is spoken by the child's community. The capacity is inherited, but the particular language is learned.