Okay, so Islam is a religion that is practiced by some people in different parts of the world. A long, long time ago, in the part of the world that we now call Spain, some people decided to follow Islam as their religion. They built special places called mosques where they could go to worship and pray.
For a while, things went well between the people who followed Islam and the other people who lived in Spain. They traded goods and ideas and made beautiful art and buildings together. But then, some other people came to Spain who didn't like the people who followed Islam. They wanted everybody in Spain to follow a different religion. They fought with the people who followed Islam and eventually took over the country.
This meant that the people who followed Islam were not allowed to practice their religion freely anymore. They had to hide and worship in secret. But, even when it was hard, they still kept their faith in Islam alive. They continued to pass their religion on to their children and hold on to their traditions.
Today, there are still some people in Spain who follow Islam. They have the right to practice their religion freely and there are mosques where they can gather to pray and worship. It's important to remember that people have the right to their own beliefs and we should always respect that.