A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape. This phenomenon occurs when a massive star collapses under the force of its own gravity, creating a singularity, or a point of infinite density, surrounded by an event horizon, the boundary from within which escape is impossible. In Hebrew, a black hole is called חור שחור (pronounced "chor shachor"). In other languages, it is known as trou noir in French, Schwarzes Loch in German, and buco nero in Italian. Black holes are a key area of study in astrophysics, offering insights into the nature of gravity, spacetime, and the universe's most extreme conditions. They can be detected through their effects on nearby matter, such as the emission of X-rays from accretion disks or the bending of light through gravitational lensing.