IETF BCP 47 is a standard developed by the Internet Engineering Task Force that defines a way to represent language tags. These tags help identify languages, scripts, and regional variations in a consistent format, making it easier for software and systems to process and display content in different languages. The standard specifies a syntax for language tags, which can include primary language codes, subtags for regional dialects, and additional information like script. This allows for precise identification of languages, enhancing communication and accessibility in multilingual environments across the Internet.