Okay kiddo, so there was a group of Muslim countries who got together in Cairo, the capital of Egypt, a long time ago. They talked about how people should be treated fairly and nicely, no matter what religion or race they come from. They wrote down these nice rules in a paper called the "Cairo Declaration on Human Rights in Islam."
This paper talks about how important it is to treat people kindly and respectfully, just like how you would want them to treat you. It says that all humans are the same and no one should be treated differently because of things like their race, religion or gender. It also talks about how important it is for people to be able to practice their own religion and beliefs, as long as it doesn’t harm anyone else.
The paper also mentions that people have the right to protest peacefully and to have access to education, work and healthcare. It even talks about how important it is to protect the environment and how it is a human responsibility to take care of the earth.
So basically, the Cairo Declaration on Human Rights in Islam is a nice set of rules that remind people to be kind and respectful to each other and to take care of the earth. It encourages everyone to work together to make the world a better place for everyone to live in.