ANSI C is a standardized version of the C programming language, established by the American National Standards Institute (ANSI) in 1989. This standardization aimed to ensure consistency and portability of C code across different platforms and compilers. ANSI C includes a set of rules and guidelines that define the syntax, semantics, and library functions of the language. The ANSI C standard is also known as C89 or C90, as it was later adopted by the International Organization for Standardization (ISO) in 1990. It serves as the foundation for many modern programming languages and has influenced the development of languages like C++ and Java. ANSI C remains widely used in system programming, embedded systems, and application development.