1. The term "dejavu," derived from the French language, describes a sensation where individuals feel a sense of familiarity with the current events, as if they have already experienced them before.2. In English, "dejavu" is explained as a strong impression that what you are currently experiencing seems to have happened in the past.3. Some people may experience a strong sense of "déjà vu" when entering a room or encountering a particular situation.4. Many signs and scenes in daily life can give people this familiar feeling.5. Psychologists believe that the feeling of "déjà vu" is not always caused by deep-seated conflicts in the subconscious; in fact, a healthy brain can produce this sensation under normal circumstances.6. People are more likely to experience "déjà vu" when they are tired or stressed.7. "Déjà vu" may sometimes be accompanied by the phenomenon of "jamais vu," which refers to the inability to recall any relevant information when seeing familiar objects or words.8. Psychologists point out that excessive exposure to information without paying attention to the sources can lead to the feeling of "déjà vu."9. This familiarity can come from various sources, including real experiences and fictional elements.10. For example, when people encounter a description they have read in a novel, they might mistake it for a memory from a past life. The above content has been polished and rewritten to define and describe the phenomenon of "déjà vu," maintaining the accuracy and fluency of the original information.