LessWrong is an online community and forum focused on rationality, decision-making, and effective thinking. It was founded in 2009 and aims to improve the quality of reasoning among its members through discussions, articles, and shared resources. The community often explores topics related to artificial intelligence, philosophy, and effective altruism. The platform encourages users to engage in critical thinking and to challenge their own beliefs. Members share insights on cognitive biases, logical fallacies, and strategies for better decision-making. Overall, LessWrong serves as a hub for those interested in enhancing their rational thinking skills.