This is the 328th most frequent Hindi word.
aap
The Hindi word "aap" means "you" (formal/respectful).
The word 'aap' is used as a formal pronoun to address someone with respect.
आप कैसे हैं?
How are you?
Here, 'aapke' refers to possession (your) related to the person being respectfully addressed.
आपके पास पुस्तक है।
You have the book.
In this sentence, 'aap' indicates a polite request directed towards the addressed individual.