Déjà vu is a French term that translates to "already seen." It describes the feeling that a person has experienced a situation before, even if it is happening for the first time. This sensation can be brief and often leaves individuals puzzled about how they recognize a moment that is new to them. Researchers believe that déjà vu may occur due to a temporary glitch in the brain's memory processing. It can happen in various situations, such as meeting someone new or visiting a place for the first time. While it is a common experience, the exact cause remains a topic of scientific investigation.