what are #blackholes ?

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A black hole in the classical sense is a region of space-time, the gravitational attraction of which is so strong that no objects moving at the speed of light can leave it. Even quanta of light itself.
The boundary of a black hole is called the event horizon, and its size is called the gravitational radius. Black holes pull matter towards them, which forms an accretion disk around them, a giant structure around the black hole that spins rapidly. It is because of the matter that glows during rotation that scientists were able to detect the existence of black holes.

In addition, scientists often call black holes objects that do not fully correspond to their exact definition, but only approach them in their properties. This category also includes collapsing stars in the late stages of collapse.