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Standard English is the variety of English that is held to be 'correct' in the sense that it shows none of the regional or other variations that are considered by some to be ungrammatical, or non-standard English. Received Pronunciation, often called RP, is the way Standard English is spoken; without regional variations. Standard English and RP are widely used in the media and by public figures, so it has prestige status and is regarded by many as the most desirable form of the language.
It was promoted in public schools in England to develop people who came from all over the country who could understand each other easily during the days of the empire.