A troll is a term used in different contexts, including Nordic folklore and online communities. In Nordic folklore, trolls are beings that dwell in isolated areas of rocks, mountains, or caves, live together in small family units, and are rarely helpful to human beings. They are considered dangerous to humans and may be ugly and slow-witted or look and behave exactly like human beings, with no particularly grotesque characteristic about them.

In online communities, a troll is a person who intentionally tries to instigate conflict, hostility, or arguments by posting inflammatory, irrelevant, or offensive messages online or in real life). Trolls often use inflammatory messages to provoke emotional responses out of people, disrupting otherwise civil discussion. They can be found in various online platforms such as social media, forums, chat rooms, and comment sections of YouTube. Trolling can occur anywhere that has an open area where people can freely post their thoughts and opinions.

Anyone can be an Internet troll, even the nicest, most reasonable, and mild-mannered people in real life can exhibit trolling behavior once they get online. Trolls have higher levels of negative social potency, meaning that they like to cause mischief and suffering, along with the attention that entails. They take advantage of anonymity, making it easy to avoid real consequences for their behavior.

In summary, a troll can refer to a being in Nordic folklore or a person who intentionally tries to instigate conflict, hostility, or arguments in online communities.