Okay kiddo, so you know how we have our family, friends, neighbors, and classmates?
Well, in Islam, all the Muslims in the world are like one big family called the "ummah". They all believe in the same God, Allah, and follow the same religion.
The ummah is like a big team where everyone helps each other, supports each other, and cares for each other. Muslims are encouraged to be kind and compassionate to all members of the ummah, just like they would be with their own family.
Even though Muslims might come from different countries, speak different languages, and have different cultures, they all belong to the same ummah. They all have the same goal of trying to be good Muslims and live their life in obedience to Allah.
So just like we take care of our family and friends, Muslims take care of their fellow Muslims in the ummah.