This in-depth episode takes readers on a captivating journey to explore one of the greatest unsolved mysteries in cosmology - the enigma of dark matter. It delves into the historical discoveries that first hinted at the existence of this invisible substance, including the groundbreaking work of Fritz Zwicky and Vera Rubin. The article examines the unknown nature of dark matter, its gravitational effects, and the various theories and candidates proposed to explain its elusive composition, such as WIMPs, axions, and sterile neutrinos. It highlights the crucial role dark matter plays in shaping the cosmic structure of galaxies and galaxy clusters, as well as the indirect evidence from observations of the cosmic microwave background radiation. Additionally, the article outlines the ongoing efforts to detect dark matter particles through direct and indirect methods, including experiments in deep underground laboratories, searches for annihilation or decay products, and collider experiments like those at the Large Hadron Collider. The piece also addresses the challenges, controversies, and alternative theories surrounding dark matter research. Finally, it looks ahead to upcoming experiments, theoretical advancements, and the profound implications that unraveling the mystery of dark matter could have for our understanding of the universe and fundamental physics.