Dark matter, a mysterious substance that comprises about 27% of the universe, has long been a subject of fascination for physicists. The leading hypothesis, known as Cold Dark Matter (CDM), proposes that dark matter is a fluid of slowly moving particles that interact with each other and everything else in the universe mainly through gravity. However, after decades of unsuccessful searches and recent astronomical anomalies, CDM is facing challenges. Physicists are now gravitating towards a different theoretical framework, known as Self-Interacting Dark Matter (SIDM), which proposes the existence of a hidden universe of dark particles and dark forces that exists in parallel with the familiar particles and forces of normal matter.