Question

what is black hole?​

Answer 1

Answer:

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole

Answer 2

A black hole form when a large dying star collapse
the gravity created by this condensing matter complete overpower any outward force including light

Although Black hole emits no light but its presence is detectable by radio astronomy equipment

its extremely strong gravitational pull suks gas and dust towards itself forming a whirling accretion disk around the hole this disk heat any matter that crossed it