British English is the form of English used in the United Kingdom, which includes England, Scotland, Wales, and Northern Ireland. While American English and British English share the same basic grammar and most vocabulary, they differ in spelling, word choices, and some pronunciations.

British English spells many words differently: colour instead of color, favourite instead of favorite, and organise instead of organize. The British say lorry where Americans say truck, flat instead of apartment, and biscuit for what Americans call a cookie. A British student carries a rucksack to school rather than a backpack, and takes the lift instead of the elevator.

Neither version is more correct than the other. They're simply different flavors of the same language. British English itself varies across the UK: someone from London sounds quite different from someone in Edinburgh or Cardiff. If you read books by British authors like Roald Dahl or J.R.R. Tolkien, you'll encounter British spellings and vocabulary, which adds to the fun of discovering how flexible and varied English can be.