Koreans speak Korean, and knowing a few words of this will come in very handy. Unfortunately the language is rather drastically different from any Western language in its grammar, and pronunciation is rather difficult for the English speaker to get right (though not tonal). Depending on which part of the country you go to, various different dialects are spoken, though standard Korean, which is based on the Seoul dialect, is understood and spoken by almost everyone. Most notably among the dialects, the Gyeongsang dialect spoken around Busan and Daegu is considered to be rather rough and aggressive compared to standard Korean, and the Jeju dialect spoken on Jeju island is known for being almost incomprehensible to speakers of standard Korean, although the pure Jeju dialect is becoming less common.