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Description
In this colloquium I will give a short introduction to Quantum Gravity and its realisation by String Theory. As known for some time, string theory predicts a huge landscape of vacua, seen as different effective theories at low energy. However, as it became evident during the recent years that the space of theories that cannot originate from string theories is much larger than the landscape, and hence usually dubbed as the so-called swampland. I will discuss some of the properties of the swampland scenario and how it has recently led to some predictions about dark energy, dark matter and primordial black holes.