What Is Standard English?
Standard English is the type of English that's suitable for use in every type of written or spoken situation. The majority of words in English dictionaries and thesauruses are part of standard English.
The main advantage of using standard English is that it helps you to get your message across clearly and effectively, and to the widest range of people. It's also more permanent than some other forms of language, such as slang, which often go out of fashion from one generation to the next.