Language is a set of symbols being used mainly for communication. The symbols may be spoken or written. Language is an aspect of human behavior. In written form it is a long-term record of knowledge from one generation to the next while in spoken form it is a means of communication. Language is the key aspect of human intelligence.
Natural language is an ordinary language that has evolved as the normal means of communication among people. Examples: English, French, Japanese, Tamil, Arabic and Hebrew.
Constrained languages are those that have a special or limited vocabulary designed for restricted types of communication. Examples: programming languages such as C, C++ and Java and languages that apply only to a certain domain.
Definitions of language
According to Noam Chomsky, a language is a set (finite or infinite) of sentences, each finite in length and constructed out of a finite set of elements.
Characteristics of Language
It is a means of communication
It is arbitrary
It is a system of systems
It is primarily vocal
It differs from animal communication in several ways
It is a from of social behavior
It is a symbol system
Speech is a natural, convenient, rapid and the oldest means of communication.
A written language is one that uses the equivalent of typed alphabetic characters. Words are clearly separated by spaces and punctuation marks.