Standard English

the most prestigious variety of English in a particular country.

Features of Standard English
Standard English (SE) consists of standardized grammar and orthography only. It is not connected to any particular region. Thus, it does not include standardized pronunciation and may be spoken with various accents.

Uses of Standard English
SE is more commonly found in writing than speech. It is used in official contexts (such as law and government), news media, etc. As such, Standard English is the variety which is the target of language instruction.

Crystal, David. Rediscover Grammar, pages 16-17.