This episode will give you an overview of the concept of multiverse: where does it come from? What are the various meanings and ideas behind that term? I will detail different versions of this idea, coming from cosmology (the "Eternal Inflation Multiverse" or the "Cosmic Landscape Hypothesis", derived from String Theory), quantum mechanics (the "Many-Worlds Interpretation"), or the "Computational Multiverse" hypothesis. I will also tell you about thinkers such as Anaximander, Copernic or Giordano Bruno, who all contributed in their own ways to the intellectual revolutions necessary for this concept to emerge.