People worldwide have told ghost stories for centuries. Many believe spirits return after death and appear in old houses, cemeteries, or battlefields. These tales are popular in movies and campfire stories. However, modern science finds no solid evidence that ghosts exist. Surveys show over half of people in some countries believe in ghosts or spirits, but belief is not proof. Science needs proof tested again and again. Ghosts have never met this standard. Scientists say fear and superstition don't guide their work. Science relies on things that can be seen, tested, and repeated. Ghosts don't fit this because no reliable evidence appears in controlled experiments. Laboratories have never found measurable data proving ghosts exist. This is why ghosts are considered myths by scientists. British physicist Brian Cox says if ghosts were made of physical energy or matter, powerful instruments like the Large Hadron Collider would detect them. Since no signals have been found, physics does not support a hidden ghost world. The laws of physics, including the second law of thermodynamics, say energy spreads out and cannot stay in one form forever. Ghosts would need to keep energy without losing it, which breaks these laws. So why do people claim to see ghosts? Scientists suggest several reasons: 1. Psychology: Our brains look for patterns and familiar shapes. When people expect ghosts, they may mistake shadows or sounds for spirits. 2. Sleep paralysis: This disorder causes people to wake unable to move and see scary hallucinations. 3. Environment: Sounds called infrasound and gases like carbon monoxide can cause fear, discomfort, or hallucinations. 4. Culture: Ghost stories shape how we interpret strange events. Hearing about haunted places can make people expect ghosts. Ghost hunters use cameras and detectors, but these measure natural changes like wiring or air movements. No tool has proven the presence of a ghost repeatedly. Believing in ghosts can comfort people by giving hope of life after death. This emotional need helps the belief stay strong. But science shows ghost sightings have natural explanations. The brain, culture, and environment shape what we call ghosts. Though ghosts remain popular in stories and imagination, science finds no proof they exist in reality.