* Farsi is the name used by Iranians themselves to refer to their language. It comes from the word "Parsi," which is the ancient Persian word for "Persian."
* Persian is the name used by speakers of other languages to refer to the language. It comes from the ancient Greek word "Persis," which referred to the region of Persia (modern-day Iran).
So, "Farsi" and "Persian" are simply different names for the same language. They are both valid and acceptable, although Iranians generally prefer to use "Farsi."
It's important to note that "Farsi" is not a dialect of Persian. It is the standard language of Iran and is spoken by all educated Iranians.