When do Korean people use " 당신"?

Question

pascala34 · Answer

@LoveMyself97 The only thing you have to know about this word is never use this word to call someone like 'You' in English unless you want to fight them. The word 'You' is never ever 당신.

eoneo · Answer

@LoveMyself97 
(the other users above gave you good answers)

quick answer: no.
To be precise, s/he, knowing that you're not fluent in Korean, is speaking in an "easy Korean", like 'Simple/Basic English', if you're familiar with the term. (although unlike 'Basic English', 'easy Korean' is not really a thing. S/he is just using simpler grammar being considerate to you)

The use of 당신 is very deeply intertwined with the cultural part, so
take a look at the points below and
keep them in mind:
 ◆ omission of subject (along with other sentence elements) is natural in Korean, especially in spoken language. It feels rather "tiring" to place all the elements in a sentence.
  ex) 오늘 일 끝나고 뭐 하세요? (natural)  vs 오늘 당신은 일이 끝나고 무엇을 하세요? (very cringy. sounds like a machine translation) "What are you doing after work today?"
 ◆ just like the above example, as long as it's clear and obvious from the context, subject is unnecessary. For example, it won't go like
 Mom: 장 봐 왔다~ (I) did some groceries~
 You: 누가요? Who did?
Mom can also say "엄마(가) 장 봐 왔어", saying subject(엄마), but it's still clear w/o it. And for some situations subject is rather unnecessary.
 ◆ as a comparison in usage, in English, possesive pronouns are used like a definite article (the):
 "You'll need to hold it between your arms"
here, 'You=generic', 'your=the' thus same as "One has to hold it between the arms" 팔로 잡고 있어야 해요.
the "you" here is only generic, not actually 2nd pers. It can be 'one' or 'Man (German "person")' or "person"/"you" but only implied (Korean).
so if Korean was English, asking someone's name would be "What's the name?", "the name" from the context is obviously "your (addressee's) name"
 ◆ definition of 당신 by 표준국어대사전 says
1. 듣는 이를 가리키는 한국어의 2인칭 대명사
     이 일을 한 사람이 당신이오?
2. 부부관계에서 상대를 높여 부르는 2인칭 대명사
     당신, 요즘 직장에서 피곤하시죠?
3. 문어체에서 상대를 높여 부르는 2인칭 대명사
     당신의 희생을 잊지 않겠습니다.
4. 맞서 싸울 때 상대를 낮잡아 이르는 2인칭 대명사
     당신이 뭔데 참견이야?
5. (주로 부모 등 극존칭을 쓸만한 대상에게) '자기'를 높여 부르는 3인칭 재귀대명사
     아버지는 당신과 아무 상관없는 사람이라도 강자가 약자를 능멸하는 것을 보면 참지 못하신다.
 당신 is an honorific term for the addresee. However, it is scarcely used in spoken language. The common daily usages are: between a married couple, referring to an unspecified addressee in writing (written language), when arguing/fighting calling the other person (if you don't know his/her name)
 In modern Korean, you (speaker) need to know the relationship between the addressee and yourself to address the person (현대의 한국어에서 상대를 지칭할 때는 상대와 나의 관계를 알아야 한다: again, subject unnecessary in Korean). This is why Koreans use job/social title or title that shows the relationship between. 
 ◆ the 2nd person non-polite '너' is a pronoun you can freely use without reserve, meaning the only person you can freely, casually, comfortably address by 2nd person is a close friend of your age or younger. 
 ◆ 호칭 (address terms) can sometimes get tricky and difficult for the native speakers too.

p.s.
another point, 
once you become more fluent, you'll realize that the sentence ("이름이 뭐예요") is rather on the informal side of 존댓말 (polite speech), and also okay toward sb who's apparently around your age or younger, but not really toward any older/higher person.
You don't need to worry about this point until way later though.
But please be aware that in Korean honorifics 'politeness' and 'formality' are two *different* factors. You can still control the level of formality WITHIN polite speech.

When do Korean people use " 당신"? See a translation

@LoveMyself97 The only thing you have to know about this word is never use this word to call someone like 'You' in English unless you want to fight them. The word 'You' is never ever 당신.

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When do Korean people use " 당신"?