Language is a medium of communication. The set of instructions given to computers to do its work is called programming language. Computer programming languages are developed with the primary objectives of facilitating a large number of people to use computer without the need to know the details of internal structure of the computer. Using set of instructions or statements the users can develop a program or software which is called programming.Needles to say there are quite a large number of books available for C-language written for a general reader.This book provides the knowledge of C language as applicable to Bioinformatics and computational biology field.