Okay, so imagine you have a toy that you really like playing with, but one day your friend comes over and says they want to play with it too. You might decide to share the toy because you like your friend and think it's fun to play together.
Now, let's apply that idea to buildings called places of worship. These are special places that people go to for religious reasons. Sometimes, a group of people who follow a certain religion, like Islam, might want to use a building that is currently being used by another group for their own worship. This could happen because the original group no longer needs the building, or because they offer to share the space.
If the building is going to be used for Islamic worship, it will be called a mosque. The group that wants to use it will need to make some changes to the building so that it is suitable for their religious practices. For example, they might remove statues or symbols that are not part of Islam, install a pulpit for the Imam (leader of the mosque), and make sure there are separate areas for men and women to pray.
Once the necessary changes have been made, the building will be used as a mosque for the Muslim community to gather and worship. This is known as the conversion of a non-Islamic place of worship into a mosque.