Wildfly is a special kind of computer program that helps other programs run smoothly. It's like a special helper that makes sure everything is working okay in a big group of computer programs.
Imagine you are playing a game, and there are lots of other players in the game. Wildfly helps make sure your game works well with all the other players' games.
In computer talk, Wildfly is what is called a 'Java application server', which is a really fancy way of saying it helps Java programs run well. It's a bit like a train station – Java programs come to Wildfly and it makes sure they get to the right place to do their job. Just like a train station sends trains to their correct destinations safely and quickly.
Overall, Wildfly just makes sure Java programs are happy and working together nicely, like a very friendly and helpful computer butler to all the programs on your computer.