OpenAM is like a very important guardian who checks if you have permission to go into certain places or do certain things, like using an app or getting into a building. It's kind of like a superhero who has a special power to protect your personal information and make sure only the right people can access it.
When you want to use something that requires permission, like logging into a website or using a special feature in a game, you need to tell OpenAM who you are. You give it your name and a password, and then OpenAM checks to make sure you're allowed to do what you're asking to do. If you are, then you get to use the website or feature, but if you're not, then OpenAM won't let you in.
OpenAM is really good at keeping your personal information safe too. It uses special locks and keys to keep out any bad guys, so you don't need to worry about them stealing your information. And if anything goes wrong, OpenAM can quickly tell you and help fix the problem, so you can go back to using your apps and websites like normal.