Denialism is the refusal to accept established facts or evidence, often in favor of alternative explanations that lack scientific support. This behavior can be seen in various contexts, such as climate change, vaccination, and historical events. Denialists may reject overwhelming consensus among experts, leading to misinformation and public confusion. The motivations behind denialism can vary, including psychological, ideological, or financial factors. Individuals may deny facts to protect their beliefs, maintain social identity, or avoid facing uncomfortable truths. This phenomenon can hinder progress in addressing critical issues, as it creates barriers to informed decision-making and public understanding.