Okay, imagine you are playing with your toys and your friend Bob comes over to play. Bob has a different set of toys than you do, but they look really cool to you. You start playing with Bob's toys and you like them so much that you ask him if you can have some of them. Bob thinks about it and decides to share some of his toys with you.
In a way, converting from Judaism to Islam is like that. Some people who belong to the Jewish faith (which is a religion that believes in one God and follows special rules and traditions) may learn about Islam (which is another religion that also believes in one God and follows different rules and traditions) and find it really interesting or appealing. They might decide to become Muslim (which means they start following the beliefs and practices of Islam).
Just like Bob shared his toys with you, some Muslim people might help someone who is interested in Islam to learn more about it and decide if they want to become Muslim too. The process of becoming Muslim is called conversion.
However, it is important to remember that converting to Islam (or any other religion) is a big decision that you should think about carefully. Just like you don't want to give away all of your toys without thinking about it, you shouldn't change your beliefs without understanding what it means and how it could impact your life.