Learn Farsi: بازاریابی یعنی ارتباط با کسانی که به محصولات شما نیاز دارند. - Marketing means communication with those who need your products.

The phrase kasâni ke is built from kas (person) plus the plural suffix -ān and the restrictive -i, followed by the relative pronoun ke. It is the most natural and grammatically precise way to refer to a generic group of people ("anyone who" or "people who"). While ānhā ke is sometimes used, it often sounds like you are pointing to a specific, predefined group of people rather than a general category.

Why is there a be before mahsulāt-e shomā?

In Farsi, the compound verb niyāz dāshtan (to need, literally "to have need") requires the preposition be (to) for its object. You do not just need something; you "have a need to" it. That is why it is be mahsulāt-e shomā niyāz dārand.

Can ya'ni act as the main verb of the sentence here?

Yes. Although ya'ni (literally "it means") is often used as a conversational filler meaning "I mean," here it acts as the main verb linking the subject to its definition. You do not need to add the verb ast (is) at the end of the sentence because ya'ni already carries the full meaning of "means" or "is defined as."

How is the word bāzāryābi (marketing) constructed?

It is a highly logical compound noun. It combines bāzār (market) with yāb (the present stem of , to find) and the abstract noun suffix . Literally, it translates to "market-finding," which perfectly captures the concept of marketing.