C is a structured programming language developed by Dennis Ritchie in 1973 at Bell Laboratories. It is one of the most popular computer languages today because of its structure, high-level abstraction, machine independent feature. C language was developed with UNIX operating system, so it is strongly associated with UNIX, which is one of the most popular network operating system in use today and heart of internet data superhighway.
C language has evolved from three different structured language ALGOL, BCPL and B Language. It uses many concepts from these languages and introduced many new concepts such as data types, struct, pointer. In 1988, the language was formalised by American National Standard Institute(ANSI). In 1990, a version of C language was approved by the International Standard Organisation(ISO) and that version of C is also referred to as C89.