Black holes are among the most fascinating objects in our universe. Formed by the collapse of massive stars, they have a gravitational pull so intense that not even light can escape. This is why we can't see black holes directly - they don't emit light or radiation. Instead, we detect black holes by observing their effects on nearby stars and galaxies. One of the key features of a black hole is its 'event horizon'. This is essentially a boundary in space-time beyond which anything that crosses it can never return. It's like a cosmic one-way street with a strict 'no exit' policy. In 2019, scientists achieved a major breakthrough by capturing the first ever image of a black hole, located in a galaxy called M87. This image revealed a dark core encircled by a ring of light, providing concrete evidence of the black hole's existence. Inside a black hole is something called a 'singularity'. This is a point of infinite density where our known laws of physics break down. Scientists are still trying to understand this better, making black holes a subject of continuous research and discovery.