Okay, imagine you're at school and there's someone who's always trying to make you feel bad or upset you for no reason. That's like what an "AK troll" does online. They say mean or hurtful things to people they don't even know, just to get a reaction. They might use bad language, try to start arguments or make fun of other people.
But just like in school, it's important to remember that most people are nice and kind. Don't let someone else's mean words bring you down. Instead, you can ignore them or even report them to a grown-up or a website moderator. It's important to stay safe and not engage with online trolls who are just looking to cause trouble.