A troll is someone who harasses others online. They might do this by posting mean or hurtful comments, starting arguments, or even just making others feel uncomfortable. Often, trolls enjoy causing trouble and getting a reaction out of people. They might do this for attention, power, or even just because they're bored. Whatever the reason, trolling can be really harmful. It can make people feel upset, embarrassed, or even scared. If you're being harassed by a troll, it's important to remember that it's not your fault and you didn't deserve it. You can get help from friends, family, or even law enforcement if necessary.