C89, also known as ANSI C, is a standardized version of the C programming language established by the American National Standards Institute (ANSI) in 1989. It aimed to unify various dialects of C that had emerged since its creation in the early 1970s. C89 introduced a formal specification, ensuring consistency and portability across different systems. The C89 standard includes features such as function prototypes, improved type checking, and the standard library, which provides essential functions for input/output and string manipulation. This standard laid the groundwork for later versions of C, including C99 and C11, which introduced additional features and enhancements to the language.