The Great Filter is a hypothetical concept in the field of astrobiology and attempts to resolve the Fermi Paradox, which questions why, given the vast number of stars and planets in the universe, there is no clear evidence of extraterrestrial life. The Great Filter proposes that at some step from pre-life to an advanced civilization capable of colonizing galaxies, there is a highly improbable stage. This stage acts as a filter that prevents such civilizations from emerging.