Definition: The word "index.html.ja.jis" refers to a specific programming language, specifically JavaScript. In Japanese, it's known as "JIS," which stands for "Japanese Instructional System." Definition: The JIS (Japan International Standard Information System) is a standard in Japan that defines the syntax and structure of programming languages, particularly those used by computer programmers. It is the primary source text for all modern programming languages. It is also used for defining interfaces and conventions in software development, especially in the field of web development, where it is crucial to ensure code consistency between different platforms.