The Arab world refers to the Islamic countries in the Middle East I believe. Not any specific country
Iran is in the Middle East and and is also where the most recent and high profile protests against the forced wearing of the hijab have taken place. I’m pretty sure most Iranians wouldn’t take too kindly to being called Arab unless they are from the minority Iranian Arabs.
Iran is not considered part of the Arabic world and is a completely different branch of Islam.
can you please elaborate on this?different how?
Shia vs Sunni
There are sunni and shia arabs too, that's a separate distinction.
It's more that Iranians and Arabs are two distinct cultures with different languages and histories (though a lot of the more recent history is common or shared). It's like confusing Spain and Poland, yes, they're both European nations that use the latin alphabet, but you'd be wrong to call them both Iberian because of that
No, Arab implies that someone is either ethnically Arab, or that their mother tongue is a dialect of Arabic