What is the difference among "Aapko,aapka,aapki" in Hindi language?

Aap means you (used for plural and for singular with respect).

Aapko means “to you”. It is a rough translation, it basically denotes that “aap” or the second person is the subject of the verb. “To” is not added in all the cases in English though.

eg: Kya aapko vahan jaana hai? (Do you want to go there?). Here “you” is the subject of the verb “go”. To is not added in English in this case.

Usne aapko pen diya tha. (He had given a pen to you). Here to is added in English. But in Hindi, “ko” is always used.

Apka/Aapki means “your”. the suffix “ka/ki” denotes the gender of the “thing” which belongs to “you”.

eg: Aapki behen (Your sister)

Aapka bhai (Your brother)

Source(s): Native Hindi speaker

aap is you ( respectful, as against tu and tum) ko, ka ki are strictly speaking separate words, known as karaka.

Aap ka and aap ki mean the same thing, they are different because of masculine/ feminine gender. Aap ka kya haal hai/ Aap ki kya salah hai.

Aapko kya chahiye. aapko kahan jaana hai, etc