The term "en-GB" refers to the language code used to denote British English. It is part of the ISO 639 standard, which categorizes languages and their regional variations. This code is commonly used in software, websites, and applications to specify that the content is tailored for users in the United Kingdom. British English differs from other forms of English, such as en-US (American English), in terms of spelling, vocabulary, and grammar. For example, words like "colour" and "favour" are spelled with a "u" in British English, while in American English, they are spelled "color" and "favor."