The Persian tribes were the name of a group of Indo-European (Aryan) peoples, who entered the Iranian plateau from the northwest with the Medes (one of the ancient tribes of Iran three thousand five hundred years ago) and named it Iran, meaning Aryan land.
The Iranian plateau is a vast land located between the Caspian Sea in the north and the Persian Gulf in the south and between the folds of the Alborz Mountain ranges in the north and the Zagros Mountains in the south and west.
Persians are different from modern Persian speakers. Persian speakers such as Afghans and Tajiks are not of Persian descent. They speak this language due to the spread of Persian language in the distant past.
Farsi (or Persian) speakers make up more than 60% of the population of present-day Iran, most of whom are of ancient Persian descent.