What is déjà vu? Mental illness?

Infotainment*

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So, deja'vu' is a French term which means already seen before the scene. In which we feel that what we are seeing now has happened to us before. If ever we are talking with our friends and family or have gone for a walk, sometimes it seems that we have lived this moment before. So what is this deja'vu? We will know this today. And behind this many people have found out different theories.
Out of which the first theory is reincarnation, which personally I believe that this theory has no sense. You can also give your opinion on it in the comments. So according to this theory, the memory of our previous birth is still present somewhere in our brain which comes out in the form of deja'vu. But as I told earlier, I do not believe in this theory personally, you too will definitely give your opinion in the comment.
So the second theory that has been told is Dream Based Theory. We can accept this theory as true to some extent because psychologically and scientifically, sense is made of this theory. As we all know, 90% of the people forget whatever we dream in the night. But according to this theory, those dreams are present in our memory. And he comes out as deja'vu.

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