Language tags are codes used to identify languages in a standardized way. They help computers and software understand which language is being used, ensuring proper display and functionality. For example, the tag en represents English, while fr stands for French. These tags are often used in web development, localization, and software applications. The most common format for language tags is defined by the IETF BCP 47 standard. This format can include additional information, such as regional dialects or variations. For instance, en-US specifies American English, while en-GB refers to British English, allowing for more precise communication across different cultures.