IETF Language Tags are standardized codes used to identify languages in a consistent way. They are defined by the Internet Engineering Task Force (IETF) and help ensure that software and web content can accurately represent different languages. These tags typically consist of a primary language code, which may be followed by subtags for dialects, regions, or script variations. For example, the tag "en-US" represents American English, while "fr-CA" denotes Canadian French. By using these tags, developers and content creators can improve accessibility and user experience for speakers of various languages across the internet.