In computing C is a general-purpose programming language initially developed by Deniis Ritchie. Its Design Provides Constricts that map efficiently to typical instructions, and therefore it has found lasting use in application that had formerly been code in assembly language, most notably system software like the Unix computer operating system .C is one of the most widely used programming languages of all time and many later languages of all time and many later languages have borrowed directly from C, including C++, C#, JavaScript, Perl, PHP and Unix's C shell etc.