According to the theory of general relativity, a sufficiently compact mass has the capacity to distort space-time thus forming what is commonly called a black hole, a point around where the gravitational force is too strong. Imagine a giant building, a skyscraper for example, compacted and compressed to the size of a Rubik's cube. This happens to the dying massive star at the end of its life. For almost 200 years now, theorists have postulated the existence of black holes and there is now strong evidence demonstrating that most, if not all, galaxies have black holes of which there are essentially millions. even billions of times heavier than the sun (Volonteri, 2010). Coined in 1967 by American physicist John Arichbald Wheeler, the term "black hole" refers to a region of space-time from which the gravitational pull is so strong that it does not allow anything, including light , to escape (Begelman, 2003). , which implies that black holes cannot be observed. Simply put, light cannot escape because the black hole is moving at the speed of light. It is as if two baseballs were thrown side by side, but the observer at ball level can only see one baseball. We will explore the concept of black holes, that is to say everything we currently know about this phenomenon, how they form and what we can learn from them; Likewise, this essay will also shed light on how black holes are detected and how they are created. The appearance of an event horizon, the boundary in space-time across which matter and light are drawn inward toward the black hole mass that becomes permanently trapped, is the most characteristic of a black hole. As previously stated, even light cannot escape from a black hole since all that is in the middle of paper... the remnants of massive stars that have eventually exhausted their fuel, in addition to black holes super massive. in their centers. The gravitational pull around black holes is so strong that almost nothing that enters them, including light, barely escapes and not all black holes have hair since regardless of their mass, they can all be characterized by their mass, their angular momentum as well as their charge. . Black holes are difficult to study because they are not visible, but despite their invisibility, astronomers can infer the presence of black holes through their interaction with other matter as well as electromagnetic radiation such as light ; this led to the discovery of two types of black holes, the stellar-mass black hole, which is believed to be only a few times heavier than the sun, and the supermassive black hole which is about as heavy as a small galaxy..