Jewish messianism is the belief that a special person, called the Messiah, will come one day to bring peace and happiness to the world. According to Jewish tradition, the Messiah will be a descendant of King David and will gather Jewish people from all over the world to return to Israel.
Think of it like this: Imagine you and your friends are playing a big game of hide-and-seek, but one of your friends is really good at hiding and nobody can find them. You might start to feel like the game isn't that fun anymore because you want to be with all of your friends.
For Jewish people, it's a bit like that. They sometimes feel like they are separated from their homeland and that they are waiting for the Messiah to come back and bring everyone together.
Jewish messianism also teaches that the Messiah will make everything better - there will be no more wars, people will be happy, and the world will be a nicer and more peaceful place.
So, it's like waiting for a superhero to show up and make everything right!