These are words that Korean has "borrowed" from other languages. Technically speaking, Sino Korean words are actually loan words but due to huge amount of words that are borrowed, how long they have been in the language, they have their own special designation. More common loan words that we think of are things like 피자, 치킨 and so on. Many are even used as Konglish portmanteaus like 핸드폰.
Survival Korean
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Survival Korean