A Black hole is defined as a region of space-time from which gravity prevents any thing including light from escaping. These are the areas of intense gravitational pressure. The pressure is thought to be so intense that finite matter is actually squished into infinite density.
The no-hair theorem states, once it achieves a stable condition after formation, a black hole has only three independent properties - mass, charge and angular momentum.
Gravitational Lensing by a black hole which
distorts the image of a galaxy in the background
Event Horizon
The defining feature of a black hole in the appearance of an event horizon - a boundary in space-time through which matter and light can pass inward toward the mass of black hole. Nothing, not even light can escape from inside the event horizon. The event horizon is referred to as such because if an event occur within the boundary, information from that event cannot reach an outside observer, making it impossible to determine if such an event occurred.
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