Abstract
The universe goes through several phase transitions during its formative stages. Cosmic reionisation is the last of them, where ultraviolet and X-ray radiation escape from the first generations of galaxies heating and ionising their surroundings and subsequently the entire intergalactic medium. There is strong observational evidence that cosmic reionisation ended approximately one billion years after the Big Bang, but there are still uncertainties that will be clarified with upcoming optical, infrared, and radio facilities in the next decade. This article gives an introduction to the theoretical and observational aspects of cosmic reionisation and discusses their role in our understanding of early galaxy formation and cosmology.
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