Belief revision is the process of changing one's beliefs in response to new evidence or information. It involves evaluating existing beliefs and determining whether they should be adjusted, discarded, or reinforced based on the credibility and relevance of the new data. This process is essential in fields like philosophy, artificial intelligence, and cognitive science. In belief revision, individuals often use logical frameworks to assess how new information interacts with their current beliefs. Techniques such as Bayesian updating help quantify the degree of belief change, allowing for a systematic approach to integrating new insights while maintaining coherence in one's belief system.