Standard English refers to the accepted form of the English language used for official purposes in Anglophone countries. It encompasses grammar, vocabulary, and spelling. In Britain, Standard English is associated with Received Pronunciation and UK Standard English, while in the US it is associated with General American.
There are some differences between British and American English, primarily in pronunciation but also in vocabulary, grammar, and spelling. The differences are not huge, as the languages have remained relatively similar compared to other languages that diverged more after colonial periods.
World Englishes refers to localized varieties of English that have developed in former British colonies and areas influenced by the US. Over time, English varieties have emerged and adapted to local contexts