"Queen's English" refers to the standard form of British English traditionally spoken by the British royal family and the educated classes. It is characterized by its pronunciation, grammar, and vocabulary, often considered a model of proper English. This form of English is sometimes associated with Received Pronunciation (RP), which is a specific accent that is often perceived as prestigious.
The term is often used to describe a level of English that is clear, articulate, and free from regional dialects. While it is not the only way to speak English, it represents a certain standard that many people aspire to, especially in formal settings such as public speaking or broadcasting.