Déjà vu

Déjà vu is when you feel like you have already had an experience, even though you know you haven't. It often feels like you've seen or done something before, even if you know that is not true. It's common to feel déjà vu in strange places or in new situations, like being somewhere for the first time. It's like getting a feeling of familiarity in an unfamiliar situation. Scientists don't really know why it happens, but it's a common experience for many people.