So there was a long time ago a really, really great warrior named Alexander. He was very, very powerful and he conquered a lot of lands and people. In the Quran, which is a holy book for Muslims, there is a story about Alexander. It says that he was a great explorer and he went on a journey to find the end of the world where he saw the sun set into the ocean.
This story is kind of like a legend, and Muslims believe it is just a story, not necessarily true. But the story also talks about how Alexander was a good person and he believed in God, which is important in Islam. Overall, the story of Alexander in the Quran is just one of many stories that Muslims read and learn from.