What is Zoroastrianism and who was Zarathustra

Zarathustra (Zoroaster) has started a new way of thinking centures ago and founded the religion of Zoroastrianism. Later Zoroastrianism became the religion of millions of people within ancient Persian empire and the reason of lots of new things in the histoey of humanity that last until nowadays.
Zoroastrianism is not a big religion nowadays and its followers are very limited, and not everyone is aware of its deep influence on the history of humanity.
On this live we will talk about Zoroastrianism and Zarathustra from historical point of view, and shed more lights on the past and current time of this religion, also will discuss some of its influences in ancient Persia, modern Iran and culture of the world.